Fix docker image prefix

Author: jpraynaud

.github/workflows/pre-release.yml

@@ -125,7 +125,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
             pre-release
-            type=raw,value={{branch}}-{{sha}}
+            type=raw,value=${{ github.ref_name }}-{{sha}}
 
       - name: Download built artifacts (Linux-x64)
         uses: dawidd6/action-download-artifact@v2

.github/workflows/release.yml

@@ -41,7 +41,7 @@ jobs:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
           tags: |
             latest
-            type=raw,value={{branch}}-{{sha}}
+            type=raw,value=${{ github.ref_name }}-{{sha}}
 
       - name: Download built artifacts (Linux-x64)
         uses: dawidd6/action-download-artifact@v2