add steps to prevent and allow main merge during the release procedure

Signed-off-by: Shinya Hayashi <[email protected]>

RELEASE.md

@@ -39,13 +39,15 @@ The result should look something like:
 Bump version
 ------------
 
-1. Determine a new version number by [checking the differences](https://github.com/topolvm/pie/compare/vX.Y.Z...main) since the last release. Then, define the `VERSION` variable.
+1. Go to [the rule setting page](https://github.com/topolvm/pie/settings/rules/1550843) and change the value of "Enforcement status" to `Active`.
+
+2. Determine a new version number by [checking the differences](https://github.com/topolvm/pie/compare/vX.Y.Z...main) since the last release. Then, define the `VERSION` variable.
 
     ```console
     VERSION=1.2.3
     ```
 
-2. Add a new tag and push it.
+3. Add a new tag and push it.
 
     ```console
     git switch main
@@ -54,15 +56,15 @@ Bump version
     git push origin v$VERSION
     ```
 
-3. Once a new tag is pushed, [GitHub Actions][] automatically
+4. Once a new tag is pushed, [GitHub Actions][] automatically
    creates a draft release note for the tagged version,
    builds a tar archive for the new release,
    and attaches it to the release note.
    
    Visit https://github.com/topolvm/pie/releases to check
    the result. 
 
-4. Edit the auto-generated release note
+5. Edit the auto-generated release note
    and remove PRs which contain changes only to the helm chart.
    Then, publish it.
 
@@ -74,19 +76,23 @@ This will prevent the pie version from going up just by modifying the Helm Chart
 
 You must change the version of Chart.yaml when making changes to the Helm Chart. CI fails with lint error when creating a Pull Request without changing the version of Chart.yaml.
 
-1. Determine a new version number by [checking the differences](https://github.com/topolvm/pie/compare/pie-chart-vX.Y.Z...main) since the last release. Then, manually run the workflow to create a PR to update the Helm Chart.
+1. If necessary, go to [the rule setting page](https://github.com/topolvm/pie/settings/rules/1550843) and change the value of "Enforcement status" to `Active`.
+   - If you are here after releasing the app, you should already have this setting changed.
+
+2. Determine a new version number by [checking the differences](https://github.com/topolvm/pie/compare/pie-chart-vX.Y.Z...main) since the last release. Then, manually run the workflow to create a PR to update the Helm Chart.
 
    https://github.com/topolvm/pie/actions/workflows/create-chart-update-pr.yaml
 
-2. Review and merge the auto-created PR.
+3. Review and merge the auto-created PR.
+   - Before merging, go to [the rule setting page](https://github.com/topolvm/pie/settings/rules/1550843) and change the value of "Enforcement status" to `Disabled`. 
 
-3. Manually run the GitHub Actions workflow for the release.
+4. Manually run the GitHub Actions workflow for the release.
 
    https://github.com/topolvm/pie/actions/workflows/helm-release.yaml
 
    When you run workflow, [helm/chart-releaser-action](https://github.com/helm/chart-releaser-action) will automatically create a GitHub Release.
 
-4. Edit the auto-generated release note as follows:
+5. Edit the auto-generated release note as follows:
    1. Select the "Previous tag", which is in the form of "pie-chart-vX.Y.Z".
    2. Clear the textbox, and click "Generate release notes" button.
    3. Remove PRs which do not contain changes to the helm chart.