Add .gitea/workflows/dockerbuild.yml

Adding new workflow to automatically build a container image, courtesy of Joost : https://www.vanmeeuwen.dev/blog/automating-docker-builds-with-gitea-actions

.gitea/workflows/dockerbuild.yml

@@ -0,0 +1,42 @@
+name: Build and Push 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: git.phyllo.me
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Build Docker Image
+        env:
+          BRANCH_NAME: ${{ github.ref_name }}
+          SHORT_HASH: ${{ github.sha }}
+        run: |
+          # Build the image with the commit hash tag
+          docker build --build-arg BUILD_IDENTIFIER=${SHORT_HASH:0:5} -t https://git.phyllo.me/devops/fedora-runner-image:${BRANCH_NAME}-${SHORT_HASH:0:5} .
+
+          # Tag the same image as "latest"
+          docker tag https://git.phyllo.me/devops/fedora-runner-image:${BRANCH_NAME}-${SHORT_HASH:0:5} https://git.phyllo.me/devops/fedora-runner-image:${BRANCH_NAME}-latest
+
+      - name: Push Docker Images
+        env:
+          BRANCH_NAME: ${{ github.ref_name }}
+          SHORT_HASH: ${{ github.sha }}
+        run: |
+          docker push https://git.phyllo.me/devops/fedora-runner-image:${BRANCH_NAME}-${SHORT_HASH:0:5}
+          docker push https://git.phyllo.me/devops/fedora-runner-image:${BRANCH_NAME}-latest
+
+      - name: Log out from registry
+        if: always()
+        run: docker logout git.phyllo.me