CI workflow to create floating tag

Author: zefir-git

.github/workflows/major.yaml

@@ -0,0 +1,66 @@
+name: Tag Major Version
+
+on:
+  push:
+    tags: [v*.*.*]
+
+permissions:
+  contents: write
+
+jobs:
+  update-major-version-tag:
+    name: Update major version tag
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Get major version
+        id: major-version
+        run: |
+          VERSION=${GITHUB_REF#refs/tags/}
+          MAJOR=${VERSION%%.*}
+          echo "sha=$(git rev-list -n 1 $VERSION)" >> $GITHUB_OUTPUT
+          echo "major=$MAJOR" >> $GITHUB_OUTPUT
+
+      - name: Find major tag
+        id: major-tag
+        uses: actions/github-script@v7
+        with:
+          result-encoding: string
+          script: |
+            try {
+              await github.rest.git.getRef({
+                  ...context.repo,
+                  ref: "tags/${{ steps.major-version.outputs.major }}"
+              });
+              return "1";
+            }
+            catch (err) {
+              if (err.status === 404)
+                  return "0";
+              throw err;
+            }
+
+      - name: Create major version tag
+        if: steps.major-tag.outputs.result == '0'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.git.createRef({
+              ...context.repo,
+              ref: "refs/tags/${{ steps.major-version.outputs.major }}",
+              sha: "${{ steps.major-version.outputs.sha }}"
+            })
+
+      - name: Move major version tag
+        if: steps.major-tag.outputs.result == '1'
+        uses: actions/github-script@v7
+        with:
+          script: |
+            github.rest.git.updateRef({
+              ...context.repo,
+              ref: "tags/${{ steps.major-version.outputs.major }}",
+              sha: "${{ steps.major-version.outputs.sha }}",
+              force: true
+            })