Add Dockerfile and GHCR publishing workflow for MCP server (#350)

Add Dockerfile and GHCR publishing workflow for MCP server

Author: kvz

.changeset/docker-image.md

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+---
+'@transloadit/mcp-server': patch
+---
+
+Add Dockerfile and GHCR publishing workflow

.github/workflows/docker-mcp.yml

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+name: Docker MCP Server
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  docker:
+    name: Build and push MCP server image
+    if: startsWith(github.event.release.tag_name, '@transloadit/mcp-server@')
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Extract version from release tag
+        id: version
+        run: |
+          TAG="${{ github.event.release.tag_name }}"
+          VERSION="${TAG#@transloadit/mcp-server@}"
+          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
+
+      - uses: docker/setup-buildx-action@v3
+
+      - uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: docker/build-push-action@v6
+        with:
+          context: packages/mcp-server
+          file: packages/mcp-server/Dockerfile
+          push: true
+          tags: |
+            ghcr.io/transloadit/mcp-server:${{ steps.version.outputs.version }}
+            ghcr.io/transloadit/mcp-server:latest
+          labels: |
+            org.opencontainers.image.title=Transloadit MCP Server
+            org.opencontainers.image.description=Process video, audio, images, and documents with 86+ cloud media processing robots
+            org.opencontainers.image.source=https://github.com/transloadit/node-sdk
+            org.opencontainers.image.version=${{ steps.version.outputs.version }}
+            org.opencontainers.image.licenses=MIT
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

packages/mcp-server/Dockerfile

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+FROM node:22-alpine
+RUN npm install -g @transloadit/mcp-server@latest
+USER node
+ENTRYPOINT ["transloadit-mcp", "stdio"]