Add common stale action

Also update README.

Signed-off-by: Tomáš Hozza <[email protected]>

README.md

@@ -1,2 +1,9 @@
 # common-stale-action
-Common stale action for all osbuild repositories.
+
+Common stale action for all osbuild repositories. This actions makes it easy to adjust stale settings for all osbuild repositories in one place.
+
+For now, only pull requests are checked. The action will:
+
+* Mark pull requests as stale if they have not been updated for 30 days by adding the `Stale` label.
+* Remove the `Stale` label if a pull request is updated.
+* Close pull requests that have been stale for 7 days.

action.yml

@@ -0,0 +1,21 @@
+name: "Close stale PRs"
+description: "Common stale PRs action for all osbuild repositories"
+
+inputs:
+  token:
+    description: "A GitHub token for marking stale PRs and closing them"
+    required: true
+
+runs:
+  using: "composite"
+  steps:
+    - uses: actions/stale@v8
+      with:
+        repo-token: "${{ inputs.TOKEN }}"
+        stale-pr-message: 'This PR is stale because it has been open 30 days with no activity. Remove "Stale" label or comment or this will be closed in 7 days.'
+        close-pr-message: 'This PR was closed because it has been stalled for 30+7 days with no activity.'
+        days-before-stale: 30
+        days-before-close: 7
+        # Do not touch any issues
+        days-before-issue-stale: -1
+        days-before-issue-close: -1