Change Jenkins section to CI/CD

CI/CD will include Jenkins and other CI/CD systems.

In addition, added a couple of questions on various topics.

Author: abregman

README.md

@@ -0,0 +1,15 @@
+## AZ-900
+
+<details>
+<summary>What is cloud computing?</summary><br><b>
+
+[Wikipedia](https://en.wikipedia.org/wiki/Cloud_computing): "Cloud computing is the on-demand availability of computer system resources, especially data storage (cloud storage) and computing power, without direct active management by the user"
+</b></details>
+
+<details>
+<summary>What types of clouds (or cloud deployments) are there?</summary><br><b>
+
+  * Public - Cloud services sharing computing resources among multiple customers
+  * Private - Cloud services having computing resources limited to specific customer or organization, managed by third party or organizations itself
+  * Hybrid - Combination of public and private clouds
+</b></details>

certificates/cloud-practitioner.md renamed to certificates/aws-cloud-practitioner.md

@@ -18,3 +18,4 @@ Google Cloud Plataform Logo created by <a href="https://about.google/">Google®<
 VirtualBox Logo created by <a href="http://www.iconarchive.com/artist/dakirby309.html">dAKirby309</a>, under the <a href="https://creativecommons.org/licenses/by-nc/4.0/">Creative Commons Attribution-Noncommercial 4.0 License</a>.
 Certificates logo by <a href="https://www.iconfinder.com/Flatart">Flatart</a><br>
 Storage icon by <a href="https://www.iconfinder.com/iconic_hub">Dinosoftlab</a><br>
+CI/CD icon made made by <a href="https://www.flaticon.com/authors/freepik" title="Freepik">Freepik</a> from <a href="https://www.flaticon.com/" title="Flaticon">www.flaticon.com</a></div>

certificates/azure-fundamentals-az-900.md

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+## Multi-Stage Builds
+
+### Objective
+
+Learn about multi-stage builds
+
+### Instructions
+
+1. Without actually building an image or running any container, use the following Dockerfile and convert it to use multi-stage:
+
+```
+FROM nginx
+RUN apt-get update \
+ && apt-get install -y curl python build-essential \
+ && apt-get install -y nodejs \
+ && apt-get clean -y
+RUN mkdir -p /my_app
+ADD ./config/nginx/docker.conf /etc/nginx/nginx.conf
+ADD ./config/nginx/k8s.conf /etc/nginx/nginx.conf.k8s
+ADD app/ /my_cool_app
+WORKDIR /my_cool_app
+RUN npm install -g ember-cli
+RUN npm install -g bower
+RUN apt-get update && apt-get install -y git \
+ && npm install \
+ && bower install \
+RUN ember build — environment=prod
+CMD [ “/root/nginx-app.sh”, “nginx”, “-g”, “daemon off;” ]
+```
+
+2. What are the benefits of using multi-stage builds?

credits.md

@@ -0,0 +1,58 @@
+## Multi-Stage Builds
+
+### Objective
+
+Learn about multi-stage builds
+
+### Instructions
+
+1. Without actually building an image or running any container, use the following Dockerfile and convert it to use multi-stage:
+
+```
+FROM nginx
+RUN apt-get update \
+ && apt-get install -y curl python build-essential \
+ && apt-get install -y nodejs \
+ && apt-get clean -y
+RUN mkdir -p /my_app
+ADD ./config/nginx/docker.conf /etc/nginx/nginx.conf
+ADD ./config/nginx/k8s.conf /etc/nginx/nginx.conf.k8s
+ADD app/ /my_cool_app
+WORKDIR /my_cool_app
+RUN npm install -g ember-cli
+RUN npm install -g bower
+RUN apt-get update && apt-get install -y git \
+ && npm install \
+ && bower install \
+RUN ember build — environment=prod
+CMD [ “/root/nginx-app.sh”, “nginx”, “-g”, “daemon off;” ]
+```
+
+2. What are the benefits of using multi-stage builds?
+
+### Solution
+
+1. One possible solution (the emphasize is on passing the app from the first stage):
+
+```
+FROM node:6
+RUN mkdir -p /my_cool_app
+RUN npm install -g ember-cli
+RUN npm install -g bower
+WORKDIR /my_cool_app
+RUN npm install
+ADD app/ /my_cool_app
+RUN bower install
+RUN ember build — environment=prod
+
+FROM nginx
+RUN mkdir -p /my_cool_app
+ADD ./config/nginx/docker.conf /etc/nginx/nginx.conf
+ADD ./config/nginx/k8s.conf /etc/nginx/nginx.conf.k8s
+# Copy build artifacts from the first stage
+COPY — from=0 /my_cool_app/dist /my_cool_app/dist
+WORKDIR /my_cool_app
+CMD [ “/root/nginx-app.sh”, “nginx”, “-g”, “daemon off;” ]
+```
+
+2. Multi-stages builds allow you to produce smaller container images by splitting the build process into multiple stages as we did above. The app image doesn't contain anything related to the build process except the actual app.