fix actionlint warnings

.github/workflows/release.yml

@@ -11,21 +11,21 @@ on:
 
 jobs:
   release:
-    if: github.event.action != 'labeled'
+    if: ${{ github.event.action != 'labeled' }}
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
 
       # Bump version on merging Pull Requests with specific labels.
       # (bump:major,bump:minor,bump:patch)
       - id: bumpr
-        if: "!startsWith(github.ref, 'refs/tags/')"
+        if: "${{ !startsWith(github.ref, 'refs/tags/') }}"
         uses: haya14busa/action-bumpr@v1
 
       # Update corresponding major and minor tag.
       # e.g. Update v1 and v1.2 when releasing v1.2.3
       - uses: haya14busa/action-update-semver@v1
-        if: "!steps.bumpr.outputs.skip"
+        if: "${{ !steps.bumpr.outputs.skip }}"
         with:
           tag: ${{ steps.bumpr.outputs.next_version }}
 
@@ -39,7 +39,7 @@ jobs:
 
       # Create release.
       - uses: actions/create-release@v1
-        if: "steps.tag.outputs.value != ''"
+        if: "${{ steps.tag.outputs.value != '' }}"
         env:
           # This token is provided by Actions, you do not need to create your own token
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -51,7 +51,7 @@ jobs:
           prerelease: false
 
   release-check:
-    if: github.event.action == 'labeled'
+    if: "${{ github.event.action == 'labeled' }}"
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2