Add workflow_dispatch trigger to Docker MCP workflow (#352)

Add workflow_dispatch trigger to Docker MCP workflow

Author: kvz

.github/workflows/docker-mcp.yml

@@ -3,23 +3,34 @@ name: Docker MCP Server
 on:
   release:
     types: [published]
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'MCP server version to build (e.g. 0.3.8)'
+        required: true
 
 jobs:
   docker:
     name: Build and push MCP server image
-    if: startsWith(github.event.release.tag_name, '@transloadit/mcp-server@')
+    if: >-
+      github.event_name == 'workflow_dispatch' ||
+      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
+      - name: Extract version
         id: version
         run: |
-          TAG="${{ github.event.release.tag_name }}"
-          VERSION="${TAG#@transloadit/mcp-server@}"
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
+            VERSION="${{ github.event.inputs.version }}"
+          else
+            TAG="${{ github.event.release.tag_name }}"
+            VERSION="${TAG#@transloadit/mcp-server@}"
+          fi
           echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
 
       - uses: docker/setup-buildx-action@v3