Add maintenance actions

.github/workflows/close-stale.yml

@@ -0,0 +1,22 @@
+#
+# close-stale.yml
+# Close open issues after a period of inactivity
+#
+
+name: "Close stale issues"
+
+on:
+  schedule:
+  - cron: "56 * * * *"
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/stale@v3
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label / comment or this will be closed in 5 days.'
+        days-before-stale: 30
+        days-before-close: 5
+        stale-issue-label: 'stale-closing-soon'

.github/workflows/lock-closed.yml

@@ -0,0 +1,18 @@
+#
+# lock-closed.yml
+# Lock closed issues after a period of inactivity
+#
+
+name: "Lock closed issue"
+
+on:
+  issues:
+    types: [closed]
+
+jobs:
+  lock:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: OSDKDev/lock-issues@v1.1
+      with:
+        repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/test-builds.yml

@@ -9,7 +9,6 @@ on:
   pull_request:
     branches:
     - bugfix-2.0.x
-    - dev-2.1.x
     paths-ignore:
     - config/**
     - data/**