add github actions

.github/workflows/build-tag.yml

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+name: Build Release JARs and docker containers
+
+on:
+  push:
+    tags:
+      - '*'
+
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          java-version: '17'
+          distribution: 'adopt'
+
+      - name: Build JAR
+        run: ./mvnw package
+
+      - name: release
+        uses: actions/create-release@v1
+        id: create_release
+        with:
+          draft: false
+          prerelease: false
+          release_name: ${{ steps.version.outputs.version }}
+          tag_name: ${{ github.ref }}
+          body: my wonderful release ${{ github.ref_name }}
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+
+      - name: upload linux artifact
+        uses: actions/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: target/twelve-factor-demo.jar
+          asset_name: twelve-factor-demo-${{ github.ref_name }}.jar
+          asset_content_type: application/zip
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Log in to Docker registry
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push Docker container
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: intesys/twelve-factor-app-kotlin:${{ github.ref_name }}

.github/workflows/build.yml

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+name: Build JARs and docker containers
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Set up JDK 17
+        uses: actions/setup-java@v2
+        with:
+          java-version: '21'
+          distribution: 'adopt'
+
+      - name: Build JAR
+        run: ./mvnw package
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Log in to Docker registry
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Build and push Docker container
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          push: true
+          tags: intesys/twelve-factor-app-kotlin:latest
+
+      - name: Upload JAR artifact
+        uses: actions/upload-artifact@v2
+        with:
+          name: twelve-factor-demo.jar
+          path: target/twelve-factor-demo.jar