Increment build number only for GH release

.github/workflows/create_release.yml

@@ -79,7 +79,10 @@ jobs:
           echo -n "$FIREBASE_OPTIONS" | base64 --decode --output $FIREBASE_OPTIONS_PATH
           cp $FIREBASE_OPTIONS_PATH ./lib
 
+      # This step makes sense when Github release is enabled because this release increments the build number.
+      # Therefore here we have to increment it as well to build an apk with the same build number.
       - name: Increment build number & replace version number
+        if: ${{ inputs.github-release }}
         run: perl -i -pe 's/^(version:\s+)(\d+\.\d+\.\d+)(\+)(\d+)$/$1."${{ github.event.inputs.version }}".$3.($4+1)/e' pubspec.yaml
 
       - name: Install Flutter