feat: Added docs for Docker + Dockerize the app

.dockerignore

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+.git*
+*.md
+!README.md
+.nojekyll
+.dockerignore
+LICENSE
+Dockerfile
+releases.json
+docker-compose.yml

Bash-scripting/README.md

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+## Concepts

Bash-scripting/commands/README.md

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+WIP

Docker/Dockerfile/Dockerfile-drupal

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+FROM drupal:9.3.13
+
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# this next part was corrected to be more clear on how you'd typically 
+# customize your own theme. first you need to clone the theme into this repo
+# with something like downloading the lastest theme for bootstrap
+# https://www.drupal.org/project/bootstrap and extract into themes dir on host.
+# then you'll COPY it into image here:
+
+WORKDIR /var/www/html/core
+
+COPY ./themes ./themes
+
+WORKDIR /var/www/html

Docker/Prod-app-demo/.gitignore

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+sample-data

Docker/Prod-app-demo/Dockerfile

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+FROM drupal:9.3.13
+
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /var/www/html/core
+
+COPY ./themes ./themes
+
+WORKDIR /var/www/html

Docker/Prod-app-demo/docker-compose.override.yml

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+version: '3.9'
+
+services:
+
+  drupal:
+    build: .
+    ports:
+      - "8080:80"
+    volumes:
+      - drupal-modules:/var/www/html/modules
+      - drupal-profiles:/var/www/html/profiles
+      - drupal-sites:/var/www/html/sites
+      - ./themes:/var/www/html/themes
+
+  postgres:
+    environment:
+      - POSTGRES_PASSWORD_FILE=/run/secrets/psql-pw
+    secrets:
+      - psql-pw
+    volumes:
+      - drupal-data:/var/lib/postgresql/data
+
+volumes:
+  drupal-data:
+  drupal-modules:
+  drupal-profiles:
+  drupal-sites:
+  drupal-themes:
+
+secrets:
+  psql-pw:
+    file: psql-fake-password.txt

Docker/Prod-app-demo/docker-compose.prod.yml

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+version: '3.9'
+
+services:
+
+  drupal:
+    ports:
+      - "80:80"
+    volumes:
+      - drupal-modules:/var/www/html/modules
+      - drupal-profiles:/var/www/html/profiles
+      - drupal-sites:/var/www/html/sites
+      - drupal-themes:/var/www/html/themes
+
+  postgres:
+    environment:
+      - POSTGRES_PASSWORD_FILE=/run/secrets/psql-pw
+    secrets:
+      - psql-pw
+    volumes:
+      - drupal-data:/var/lib/postgresql/data
+
+volumes:
+  drupal-data:
+  drupal-modules:
+  drupal-profiles:
+  drupal-sites:
+  drupal-themes:
+
+secrets:
+  psql-pw:
+    external: true

Docker/Prod-app-demo/docker-compose.test.yml

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+version: '3.9'
+
+services:
+
+  drupal:
+    image: custom-drupal
+    build: .
+    ports:
+      - "80:80"
+
+  postgres:
+    environment:
+      - POSTGRES_PASSWORD_FILE=/run/secrets/psql-pw
+    secrets:
+      - psql-pw
+    volumes:
+      # NOTE: this might be sample data you host in your CI server
+      # so you can do integration testing with sample data
+      # this may not work on Docker for Windows/Mac due to bind-mounting
+      # database data across OSes, which doesn't always work
+      # in those cases you should use named volumes
+      - ./sample-data:/var/lib/postgresql/data
+secrets:
+  psql-pw:
+    file: psql-fake-password.txt

Docker/Prod-app-demo/docker-compose.yml

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+version: '3.9'
+
+services:
+  drupal:
+    image: custom-drupal:latest
+
+  postgres:
+    image: postgres:14.3

Docker/Prod-app-demo/psql-fake-password.txt

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+mypasswd

Docker/README.md

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-## Concepts
+# Concepts
+
+
+## ⚫ Docker Images
+
+- Images are made up of app binaries, dependencies, and metadata. Don't contain a full OS.
+- Images are combination of mutiple layers.
+- Each Image has it down unique ID and a tag for different version.
+
+![Screenshot from 2022-11-02 11-57-19](https://user-images.githubusercontent.com/51878265/199414178-d59e8780-c140-4bf1-b27e-7e8f1c723afb.png)
+
+## ⚫ Dockerfile
+
+> Commands:
+
+- `FROM` (base image)
+- `COPY` (copy files from local to conatiner)
+- `ARG` (pass arrugments)
+- `ENV` (environment variable)
+- `RUN` (any arbitrary shell command)
+- `EXPOSE` (open port from container to virtual network)
+- `CMD` (command to run when container starts) 
+- `WORKDIR` (Create a dir where all the file will be copy and used.)
+
+To build an image from the **Dockerfile**, use this command
+
+```bash
+docker build <path> 
+// docker build .
+```
+
+**Good Practice**
+
+- Copy the dependencies 1st and then copy rest of the files.
+
+```Dockerfile
+COPY package.json ./
+RUN npm install
+COPY . ./
+```
+
+## ⚫ .dockerignore
+
+We a file `.dockerignore` which are not required when we copy files into the container.
+
+
+## ⚫ Docker Volumes
+
+We need volume to Persist our data, like databases and user info, because conatiner can go up and down, and we need some way preserve our data.
+
+We attach volume during run time
+
+```bash
+docker run -v /path/in/container
+```
+
+**Named Volume**
+We can also name the volume otherwise it will generate the ID and hard to track
+
+```bash
+docker run -v <volume name>:</path in container> <image name>
+docker run -v myvolume:/src/public nginx
+```
+
+### Bind Mounting
+
+A file or directory on the host machine is mounted into a container, i.e it will match the condition of the file syestem inside a conatiner.
+
+```bash
+docker run -v <path to your local sytem>:<conatiner path>
+docker run -v /app/content:/usr/share/nginx/html  nginx
+docker run -v $(pwd):/user/html nginx
+```
+ In compose we dont have to give the `pwd`
+
+ ```yaml
+     volumes:
+      - ./:/usr/share/nginx/html:ro
+      - ./app:/usr/share/nginx/html/app:ro 
+ ```
+
+## ⚫ Docker Compose
+
+- Compose help us defining and running multi-container Docker applications and configure relationships between containers 
+- It also save hassel from entering the commands from the CLI.
+- We have to write the configs in the YAML file, by default the file name is `docker-compose.yml`. We can run/stop by `docker compose up/down`
+
+Skeleton of Docker compose
+
+```yaml
+services:  # containers. same as docker run
+  servicename: # a friendly name. this is also DNS name inside network
+    image: # Optional if you use build:
+    command: # Optional, replace the default CMD specified by the image
+    environment: # Optional, same as -e in docker run
+    volumes: # Optional, same as -v in docker run
+  servicename2:
+
+volumes: # Optional, same as docker volume create
+
+networks: # Optional, same as docker network create
+```
+
+Sample:
+
+```yaml
+  mongo:
+    container_name: mongo
+    image: mongo:4.0
+    volumes:
+      - mongo-db:/data/db
+    networks: 
+      - my-net
+
+volumes:
+  mongo-db: # named volume
+
+networks:
+    my-net:
+        driver: bridge
+```
+
+If any container depends on another container
+
+```yaml
+depends_on:
+  - mysql-primary
+```
+
+## ⚫ Docker Swarm
+
+Docker Swarm is an orchestration management tool that runs on Docker applications.Container orchestration automates the deployment, management, scaling, and networking of containers
+
+- Docker Swarm is not enabled by deafult, we have enbaled by
+
+```bash
+docker swarm init
+```
+
+- In this we create services, insated of creating of container directly
+
+### Docker service
+
+In swarm we don't create create containers directly, instead we create service and that creates container for us. A service can run multiple node on sevral nodes.
+
+![Screenshot from 2022-11-08 13-07-01](https://user-images.githubusercontent.com/51878265/200502631-b574f4fc-8a0c-4e6f-8493-6d666ec1db2e.png)
+
+### Docker Stack
+
+When we have mutiple services and to establish the relation between them we use stack, it is same as compose file.
+Here we don't use `build:` object and there is new `deploy:` specfic to swarm to like replicas, secrets.
+
+![Screenshot from 2022-11-04 13-34-28](https://user-images.githubusercontent.com/51878265/199923225-83fe75fc-406a-4d51-b2d4-15fb5ec6b4ee.png)
+
+```yaml
+    deploy:
+      replicas: 3
+```
+We deploy stack file with this command
+
+```bash
+docker stack deploy -c file.yml <stackname>
+```
+
+### Docker Secrets
+
+Docker Swarm supports secrets. We can pass ENV variables like SSH keys, Usernames and passwords with help of that. We can pass secrets from the file or saved Docker secret.
+
+-  We can create Docker secrets though CLI `external:`
+
+```bash
+echo "<password text>" | docker secret create psql-pw -
+```
+
+or
+
+- Create a file with password and then pass the path in the stack `file:`
+
+```yaml
+services:
+    postgres:
+      image: postgres
+      secrets:
+        - post-pass
+        - post-user
+      environment:
+          POSTGRES_PASSWORD_FILE: /run/secrets/post-pass
+          POSTGRES_USER_FILE: /run/secrets/post-user
+
+secrets:
+    post-pass:
+      external: true
+    post-user:
+        file: ./post-user.txt
+```
+## Docker Healthcheck
+
+```dockerfile
+HEALTHCHECK --interval=30s --timeout=3s \
+CMD curl -f http://localhost/ || exit 1
+```
+
+## Private Docker Registry
+
+We can create a reg with the offical [Registry image](https://hub.docker.com/_/registry)
+
+ <img src="https://user-images.githubusercontent.com/51878265/200518472-c520103f-11a8-4104-a859-32f5e3c6304e.png">
+
+

Docker/YAML/compose-template.yml

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+# version isn't needed as of 2020 for docker compose CLI. 
+# All 2.x and 3.x features supported
+# Docker Swarm still needs a 3.x version
+# version: '3.9'
+
+services:  # containers. same as docker run
+  servicename: # a friendly name. this is also DNS name inside network
+    image: # Optional if you use build:
+    command: # Optional, replace the default CMD specified by the image
+    environment: # Optional, same as -e in docker run
+    volumes: # Optional, same as -v in docker run
+  servicename2:
+
+volumes: # Optional, same as docker volume create
+
+networks: # Optional, same as docker network create