Update GitHub Actions CI workflow

The GitHub Actions CI workflow has been expanded with additional steps for Docker image building and pushing. Environmental variables and branch filters have been updated for better control over the CI process. This change also includes an option for manual triggering of the workflow with given inputs.

.github/workflows/ci.yml

@@ -1,19 +1,30 @@
-name: Scala CI
+name: CI
 
 on:
+  workflow_dispatch:
+    inputs:
+      environment:
+        description: 'Deployment environment (dev|stage|prod)'
+        required: true
+        default: 'dev'
+
   push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
+    branches:
+      - develop
+      - release
 
 permissions:
   contents: read
 
 env:
+  JAVA_VERSION: 21
+  DOCKER_REGISTRY: ghcr.io
+  DOCKER_IMAGE_NAME: ${{ github.repository }}
   HTRC_NEXUS_DRHTRC_PWD: ${{ secrets.HTRC_NEXUS_DRHTRC_PWD }}
 
 jobs:
-  test:
+  ci:
+    name: Build & test
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
@@ -23,7 +34,7 @@ jobs:
       - name: Set up Java
         uses: actions/setup-java@v4
         with:
-          java-version: '21'
+          java-version: '${{ env.JAVA_VERSION }}'
           distribution: 'temurin'
           cache: 'sbt'
       - name: Run tests with coverage
@@ -33,3 +44,84 @@ jobs:
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false
+
+  docker-build:
+    name: Build and push Docker image
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    needs: ci
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Generate Dockerfile
+        run: sbt "Docker/stage"
+      - name: Show GitHub context
+        env:
+          GITHUB_CONTEXT: ${{ toJson(github) }}
+        run: echo "$GITHUB_CONTEXT"
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.DOCKER_REGISTRY }}/${{ env.DOCKER_IMAGE_NAME }}
+          tags: |
+            type=sha,prefix={{branch}}-,priority=750,enable=${{ startsWith(github.ref, 'refs/heads/') }}
+            type=ref,event=branch
+            type=ref,event=pr
+            type=pep440,pattern={{version}}
+            type=pep440,pattern={{major}}.{{minor}}
+            type=raw,value=latest,enable={{is_default_branch}}
+          labels: |
+            org.opencontainers.image.vendor=HathiTrust Research Center
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.DOCKER_REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push Docker images
+        uses: docker/build-push-action@v5
+        with:
+          context: target/docker/stage/
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+      - name: Repository Dispatch
+        if: github.event.inputs.environment == ''
+        uses: peter-evans/repository-dispatch@v3
+        env:
+          HEAD_COMMIT_MESSAGE: ${{ toJSON(github.event.head_commit.message) }}
+        with:
+          token: ${{ secrets.PAT }}
+          repository: htrc/torchlite-argocd
+          event-type: argocd
+          client-payload: >-
+            {
+              "image": "${{ fromJSON(steps.meta.outputs.json).tags[0] }}",
+              "commit_msg": "[${{ github.head_ref || github.ref_name }}]: ${{ env.HEAD_COMMIT_MESSAGE }}",
+              "repository": "${{ github.event.repository.name }}",
+              "environment": "${{ github.event.inputs.environment }}",
+              "ref": "${{ github.head_ref || github.ref_name }}"
+            }
+      - name: Manual Repository Dispatch
+        if: github.event.inputs.environment != ''
+        uses: peter-evans/repository-dispatch@v3
+        env:
+          HEAD_COMMIT_MESSAGE: ${{ toJSON(github.event.head_commit.message) }}
+        with:
+          token: ${{ secrets.PAT }}
+          repository: htrc/torchlite-argocd
+          event-type: argocd-manual
+          client-payload: >-
+            {
+              "image": "${{ fromJSON(steps.meta.outputs.json).tags[0] }}",
+              "commit_msg": "[${{ github.head_ref || github.ref_name }}]: Manual deployment by ${{ github.triggering_actor }}",
+              "repository": "${{ github.event.repository.name }}",
+              "environment": "${{ github.event.inputs.environment }}",
+              "ref": "${{ github.head_ref || github.ref_name }}"
+            }