Add workflow to document this on Docker Hub

Also update the build workflow to only run for tagged pushes to main or workflow dispatch

.github/workflows/build.yml

@@ -8,6 +8,7 @@ on:
 
 jobs:
   build:
+    if: github.event.base_ref == 'refs/heads/main' || github.event.ref == 'refs/heads/main'
     strategy:
       fail-fast: false
       matrix:
@@ -89,7 +90,7 @@ jobs:
           images: |
             ${{ vars.DOCKERHUB_REPO }}
           tags: |
-            type=raw,value=latest,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
+            type=raw,value=latest
             type=sha
             type=ref,event=branch
             type=ref,event=pr

.github/workflows/document.yml

@@ -0,0 +1,24 @@
+name: Update Docker Hub Description
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - README.md
+      - .github/workflows/document.yml
+  workflow_dispatch:
+jobs:
+  description:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Docker Hub Description
+      uses: peter-evans/dockerhub-description@v4
+      with:
+        username: ${{ vars.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+        repository:  ${{ vars.DOCKERHUB_REPO }}
+        readme-filepath: ./README.md
+        short-description: ${{ github.event.repository.description }}
+        enable-url-completion: true