fix GHCR build

Author: IgorPolyakov

.github/workflows/build.yml

@@ -24,7 +24,10 @@ jobs:
         go-version: '1.23'
 
     - name: Build Docker Image
-      run: docker build --build-arg VERSION=$(git describe --tags --always) --build-arg BUILDTIME="$(date -R)" . -f build/Dockerfile -t ghcr.io/${{ github.repository }}:latest
+      run: |
+        git fetch --unshallow --tags
+        BUILDTIME=$(date -R)
+        docker build --build-arg VERSION=$(git describe --tags --always) --build-arg BUILDTIME='$BUILDTIME' . -f build/Dockerfile -t ghcr.io/${{ github.repository }}:latest
 
     - name: Log in to GitHub Container Registry
       uses: docker/login-action@v2