feat: add Dockerfile and local docker compose example

Dockerfile

@@ -0,0 +1,18 @@
+# Build inspired by https://zwbetz.com/why-is-my-gradle-build-in-docker-so-slow/ article.
+FROM gradle:8.7.0-jdk21 AS build
+WORKDIR /home/gradle/src
+# Only copy dependency-related files.
+COPY build.gradle.kts gradle.properties settings.gradle.kts ./
+# Only download dependencies. The dependencies will be cached for next builds.
+# Eat the expected build failure since no source code has been copied yet.
+RUN gradle clean build --no-daemon > /dev/null 2>&1 || true
+# Copy project sources.
+COPY ./src ./src
+# Do the real build without the unit tests (Docker would be required for DAOs tests).
+RUN gradle bootJar -x test --no-daemon
+
+FROM eclipse-temurin:21-jre
+WORKDIR /app
+EXPOSE 8080
+COPY --from=build /home/gradle/src/build/libs/another-kaomoji-*.jar another-kaomoji.jar
+ENTRYPOINT ["java", "-jar", "/app/another-kaomoji.jar"]

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 #Tue Apr 02 18:24:22 CEST 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

local.docker-compose.yaml

@@ -0,0 +1,24 @@
+services:
+  postgresql:
+    container_name: another-kaomoji-db
+    image: postgres:16-alpine
+    restart: always
+    environment:
+      POSTGRES_PASSWORD: postgres
+    ports:
+      - "5432:5432"
+    healthcheck:
+      test: [ "CMD-SHELL", "pg_isready -U postgres" ]
+      interval: 5s
+      timeout: 5s
+      retries: 5
+  another-kaomoji:
+    container_name: another-kaomoji
+    image: another-kaomoji:local
+    restart: always
+    depends_on:
+      - postgresql
+    environment:
+      spring.datasource.url: jdbc:postgresql://postgresql:5432/postgres
+    ports:
+      - "8080:8080"