Add Dockerfile and gitea workflow

.gitea/workflows/build-image.yaml

@@ -0,0 +1,42 @@
+name: Build OCI Image
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    tags:
+      - 'v*'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          # list of Docker images to use as base name for tags
+          images: |
+            harbor.yadunut.dev/yadunut/yadunut.dev
+          # generate Docker tags based on the following events/attributes
+          tags: |
+            type=sha,suffix=-{{ commit_date 'X' }}
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+
+      - name: Login to Harbor
+        uses: docker/login-action@v3
+        with:
+          registry: harbor.yadunut.dev
+          username: ${{ secrets.HARBOR_USERNAME }}
+          password: ${{ secrets.HARBOR_PASSWORD }}
+      - name: Setup Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}