Add Forgejo CI workflow to build and push Docker image

.forgejo/workflows/docker-build.yml

@@ -0,0 +1,58 @@
+name: Build & Push Docker Image
+
+on:
+  push:
+    branches: [main, master]
+    tags: ['v*']
+  workflow_dispatch:
+    inputs:
+      api_url:
+        description: 'API URL for frontend build'
+        required: false
+        default: 'http://ut.khoavo.myds.me:8981/api'
+        type: string
+
+env:
+  REGISTRY: git.khoavo.myds.me
+  IMAGE: git.khoavo.myds.me/vndangkhoa/kv-tube
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log into Forgejo Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.FORGEJO_USERNAME }}
+          password: ${{ secrets.FORGEJO_PASSWORD }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=sha,prefix=
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=raw,value=latest,enable=${{ github.ref == 'refs/tags/v*' }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          platforms: linux/amd64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
+          build-args: |
+            NEXT_PUBLIC_API_URL=${{ github.event.inputs.api_url || 'http://ut.khoavo.myds.me:8981/api' }}