Marks PR's and issues as "Stale" and add PR auto labeler (#3738)

* Marks PR's and issues as "Stale"

* set "stale" time period to 90 days.

* Add labeler.yml

* Add labeler workflow.

* test workflow.

* undo last commit

.github/labeler.yml

@@ -0,0 +1,25 @@
+towny-war:
+    - src/com/palmergames/bukkit/towny/war/*
+
+commands:
+    - src/com/palmergames/bukkit/towny/command/*
+
+towny-objects:
+    - src/com/palmergames/bukkit/towny/object/*
+
+database:
+    - src/com/palmergames/bukkit/towny/db/*
+
+towny-chat:
+    - src/com/palmergames/bukkit/towny/chat/*
+
+economy:
+    - src/com/palmergames/bukkit/towny/object/EconomyAccount.java
+    - src/com/palmergames/bukkit/towny/object/EconomyHandler.java
+    - src/com/palmergames/bukkit/towny/TownyEconomyHandler.java
+
+events:
+    - src/com/palmergames/bukkit/towny/event/*
+
+github:
+    - .github/*

.github/workflows/label.yml

@@ -0,0 +1,18 @@
+# This workflow will triage pull requests and apply a label based on the
+# paths that are modified in the pull request.
+#
+# To use this workflow, you will need to set up a .github/labeler.yml
+# file with configuration.  For more information, see:
+# https://github.com/actions/labeler/blob/master/README.md
+
+name: Labeler
+on: [pull_request]
+
+jobs:
+    label:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/labeler@v2
+              with:
+                  repo-token: "${{ secrets.GITHUB_TOKEN }}"

.github/workflows/stale.yml

@@ -0,0 +1,21 @@
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+  - cron: "0 0 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/stale@v1
+      with:
+        repo-token: ${{ secrets.GITHUB_TOKEN }}
+        stale-issue-message: "This Issue hasn't had any activity in a while."
+        stale-pr-message: "This Pull Request hasn't had any activity in a while."
+        stale-issue-label: 'no-issue-activity'
+        stale-pr-label: 'no-pr-activity'
+        days-before-stale: 90
+