chore(ci): do not add latest tag on release candidate

Signed-off-by: Ronny Moreas <ronny.moreas@kuleuven.be>

.github/workflows/images.yaml

@@ -61,7 +61,7 @@ jobs:
             type=raw,value=canary,enable=${{ github.ref == format('refs/heads/{0}', 'main') }}
             type=ref,event=pr
             type=semver,pattern={{raw}}
-            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/') }}
+            type=raw,value=latest,enable=${{ startsWith(github.ref, 'refs/tags/v') && contains(github.ref, '.') && !contains(github.ref, '-') }}
 
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3