Add Dockerfile (#13)

Reviewed-on: https://gitea.com/gitea/gitea-mcp/pulls/13
Co-authored-by: hiifong <f@ilo.nz>
Co-committed-by: hiifong <f@ilo.nz>

.gitea/workflows/release-nightly.yml

@@ -0,0 +1,52 @@
+name: release-nightly
+
+on:
+  push:
+    branches: [main]
+    tags:
+      - "*"
+
+jobs:
+  release-image:
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_ORG: gitea
+      DOCKER_LATEST: nightly
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0 # all history for all branches and tags
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker BuildX
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKER_USER }}
+          password: ${{ secrets.DOCKER_TOKEN }}
+
+      - name: Get Meta
+        id: meta
+        run: |
+          echo REPO_NAME=$(echo ${GITHUB_REPOSITORY} | awk -F"/" '{print $2}') >> $GITHUB_OUTPUT
+          echo REPO_VERSION=${GITHUB_REF_NAME#v} >> $GITHUB_OUTPUT
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          file: ./Dockerfile
+          target: basic
+          platforms: |
+            linux/amd64
+            linux/arm64
+          push: true
+          tags: |
+            ${{ env.DOCKER_ORG }}/${{ steps.meta.outputs.REPO_NAME }}:${{ env.DOCKER_LATEST }}
+          build-args: |
+            VERSION=${{ steps.meta.outputs.DOCKER_LATEST }}