add a separate script to get the latest tag

.github/workflows/testing.yml

@@ -36,21 +36,16 @@ jobs:
       - name: Get tag
         id: get_tag
         run: |
-          for ref in $(git for-each-ref --sort=-creatordate --format '%(refname)' refs/tags); do
-            tag="${ref#refs/tags/}"
-            if echo "${tag}" | grep -Eq '^v?([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$'; then
-              latest_tag="${tag}"
-              break
-            fi
-          done
+          ./ci/get-latest-tag.sh
+#          echo "::set-output name=tag::$(./ci/get-latest-tag.sh)"
 
       - name: Lint GoReleaser
         uses: goreleaser/goreleaser-action@v2
         with:
           version: v1.2.2
           args: --skip-publish --snapshot
         env:
-          GORELEASER_CURRENT_TAG: ${{ steps.get_tag.outputs.TAG }}
+          GORELEASER_CURRENT_TAG: ${{ steps.get_tag.outputs.tag }}
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Set up Helm

ci/get-latest-tag.sh

@@ -0,0 +1,28 @@
+#!/bin/env bash
+
+set -e
+
+function get_latest_tag() {
+    git fetch --tags
+    # This suppress an error occurred when the repository is a complete one.
+    git fetch --prune || true
+
+    latest_tag=''
+
+    # Get a latest tag in the shape of semver.
+    for ref in $(git for-each-ref --sort=-creatordate --format '%(refname)' refs/tags); do
+        tag="${ref#refs/tags/}"
+        if echo "${tag}" | grep -Eq '^v?([0-9]+)\.([0-9]+)\.([0-9]+)(?:-([0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*))?(?:\+[0-9A-Za-z-]+)?$'; then
+            latest_tag="${tag}"
+        break
+        fi
+    done
+
+    if [ "${latest_tag}" = '' ]; then
+        latest_tag="${INPUT_INITIAL_VERSION}"
+    fi
+
+    echo "${latest_tag}"
+}
+
+get_latest_tag