update CI configuration for versioning and patching

Author: ndonkoHenri

.appveyor.yml

@@ -262,7 +262,7 @@ jobs:
             major=$(echo "$cv" | cut -d. -f1)
             minor=$(echo "$cv" | cut -d. -f2)
             
-            # Construct the package version: <major>.<minor>.0
+            # Construct the package version
             PKG_VER="${major}.${minor}.${GITHUB_RUN_NUMBER}"
           fi
           
@@ -278,6 +278,7 @@ jobs:
           echo "$PUB_DEV_TOKEN" | base64 --decode > $HOME/.config/dart/pub-credentials.json
 
       - name: Patch pubspec versions
+        if: startsWith(github.ref, 'refs/tags/v')
         shell: bash
         working-directory: "src"
         run: |