Revert to getting tag name from git

Author: apontzen

.github/workflows/docker.yml

@@ -17,7 +17,7 @@ jobs:
           submodules: recursive
 
       - name: Determine version tag
-        run: echo "VERSION_TAG=1.5.0" >> $GITHUB_ENV
+        run: echo "VERSION_TAG=`git describe --tags | cut -c 2-`" >> $GITHUB_ENV
 
       - name: Display version tag
         run: echo Version is ${{ env.VERSION_TAG }}