Add initial main workflow

.github/workflows/main.yml

@@ -0,0 +1,33 @@
+name: Main
+
+on:
+  push:
+    branches: ["main"]
+  pull_request: # TODO remove this line after testing
+    branches: ["main"]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Generate version based on date
+        run: echo "RELEASE_VERSION=$(date '+%Y-%m-%d_%l-%M')" >> $GITHUB_ENV
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ env.RELEASE_VERSION }}
+          build-args: |
+            APP_VERSION=${{ env.RELEASE_VERSION }}