fix: correct GitHub Actions trigger and enforce lowercase repo name for GHCR

Author: zhou-jianwen

.github/workflows/docker-image.yml

@@ -1,21 +1,23 @@
-name: Docker Iamge CI for GHCR
+name: Docker Image CI for GHCR
 
 on:
   push:
     tags:
       - 'v*.*.*'
-  pull_request:
-    tags:
-      - 'v*.*.*'
 
 jobs:
-
   build_and_publish:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - name: Build the push the image
+
+      - name: Convert repository name to lowercase
+        run: echo "LOWER_REPO_NAME=$(echo '${{ github.repository }}' | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
+      - name: Login to GitHub Container Registry
+        run: docker login --username zhou-jianwen --password ${{ secrets.GH_PAT }} ghcr.io
+
+      - name: Build and push the image
         run: |
-          docker login --username zhou-jianwen --password ${{ secrets.GH_PAT}} ghcr.io
-          docker build . --file build/Dockerfile --tag ghcr.io/${{ github.repository }}:${{ github.ref_name }}
-          docker push ghcr.io/${{ github.repository }}:${{ github.ref_name }}
+          docker build . --file build/Dockerfile --tag ghcr.io/$LOWER_REPO_NAME:${{ github.ref_name }}
+          docker push ghcr.io/$LOWER_REPO_NAME:${{ github.ref_name }}