Auto-update the staging tag

.github/workflows/update-version.yml

@@ -15,27 +15,33 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
 
       - name: Update action.yml if needed
         run: |
           set -x
-          curl -s https://api.github.com/repos/rui314/mold/releases/latest > info
-          RELEASE_TAG=$(jq -r .tag_name info | sed 's/^v//')
-          RELEASE_DATE=$(jq -r .published_at info)
+
           CURRENT_TAG=$(grep default: action.yml | head -1 | cut -d "'" -f 2)
 
+          curl -s https://api.github.com/repos/rui314/mold/releases/latest > info
+          RELEASE_TAG=$(jq -r .tag_name info | sed 's/^v//')
           echo "$RELEASE_TAG" | grep -Eq '^[0-9]+\.[0-9]+\.[0-9]+$'
 
-          if [ $CURRENT_TAG = $RELEASE_TAG ]; then
-            echo "action.yml is already up to date"
-          elif [ $(date +%s) -lt $(date -d "$RELEASE_DATE + 7 days" +%s) ]; then
-            echo "still in grace period"
-          else
+          # Update the default version and tag that commit as `staging`
+          if [ $CURRENT_TAG != $RELEASE_TAG ]; then
             sed -i "s/default: '.*'/default: '$RELEASE_TAG'/" action.yml
             git config user.name "GitHub Actions"
             git config user.email "actions@github.com"
             git commit -am "Update default version to $RELEASE_TAG"
             git push
-            git tag -f v1
+            git tag -f staging
+            git push -f --tags
+          fi
+
+          # If `staging` is 7 days old, tag it as `v1` as well
+          if [ $(git rev-parse v1) != $(git rev-parse staging) -a \
+               $(git show -s --format=%ct staging) -lt $(date -d '7 days ago' +%s) ]; then
+            git tag -f v1 $(git rev-parse staging)
             git push -f --tags
           fi