init gitea workflow

.gitea/workflows/docker.yml

@@ -0,0 +1,44 @@
+name: Build and Push ApacheOIDC Docker Image
+
+on:
+  push:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Registry
+        uses: docker/login-action@v2
+        with:
+          registry: eiche:3000
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Docker imageTags
+        run: |
+          REPOSITORY_LC=$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]')
+          echo "versioned: eiche:3000/${REPOSITORY_LC}:${GITHUB_RUN_NUMBER}"
+          echo "latest:    eiche:3000/${REPOSITORY_LC}:latest"
+
+      - name: Build Docker Image
+        run: |
+          REPOSITORY_LC=$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]')
+          # Build the image with the commit hash tag
+          docker build -t eiche:3000/${REPOSITORY_LC}:${GITHUB_RUN_NUMBER} .
+
+          # Tag the same image as "latest"
+          docker tag eiche:3000/${REPOSITORY_LC}:${GITHUB_RUN_NUMBER} eiche:3000/${REPOSITORY_LC}:latest
+
+      - name: Push Docker Images
+        run: |
+          REPOSITORY_LC=$(echo "${{ gitea.repository }}" | tr '[:upper:]' '[:lower:]')
+          docker push eiche:3000/${REPOSITORY_LC}:${GITHUB_RUN_NUMBER}
+          docker push eiche:3000/${REPOSITORY_LC}:latest
+
+      - name: Log out from registry
+        if: always()
+        run: docker logout eiche:3000