add docker workflow

.gitea/workflows/docker.yml

@@ -0,0 +1,78 @@
+name: Docker Image CI
+
+on:
+  push:
+    branches:
+      - master
+    tags:
+      - v*
+  pull_request:
+    branches:
+      - "master"
+
+permissions:
+  packages: write
+  contents: read
+
+jobs:
+  test:
+    runs-on: cth-ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: false
+          tags: gitea.b4tman.ru/b4tman/doh-proxy:test
+  push:
+    needs: test
+    runs-on: cth-ubuntu-latest
+    if: github.event_name != 'pull_request'
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            gitea.b4tman.ru/b4tman/doh-proxy
+          flavor: |
+            latest=${{ github.ref == 'refs/heads/master' }}            
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}            
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to gitea
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.b4tman.ru
+          username: b4tman
+          password: ${{ secrets.PKGS_TOKEN }}
+
+      - name: Build and push image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          #platforms: linux/amd64,linux/arm64
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+