Update issue management workflows

.github/workflows/issues-first-greet.yml

@@ -0,0 +1,26 @@
+# This workflow responds to first time posters with a greeting message.
+# Docs: https://github.com/actions/first-interaction
+name: Greet New Users
+
+# This workflow is triggered when a new issue is created.
+on:
+  issues:
+    types: opened
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  greet:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/first-interaction@v1
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          # Respond to first time issue raisers.
+          issue-message: |
+            Greetings and welcome to our community! As this is the first issue you opened here, we wanted to share some useful infos with you:
+            
+            - 🗣️ Our community on [Discord](https://discord.gg/safing) is super helpful and active. We also have an AI-enabled support bot that knows Portmaster well and can give you immediate help.
+            - 📖 The [Wiki](https://wiki.safing.io/) answers all common questions and has many important details. If you can't find an answer there, let us know, so we can add anything that's missing.

.github/workflows/issues-label-actions.yml

@@ -0,0 +1,22 @@
+# This workflow responds with a message when certain labels are added to an issue or PR.
+# Docs: https://github.com/dessant/label-actions
+name: Label Actions
+
+# This workflow is triggered when a label is added to an issue.
+on:
+  issues:
+    types: labeled
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  action:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/label-actions@v3
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          config-path: ".github/label-actions.yml"
+          process-only: "issues"

.github/workflows/issues-stale.yml

@@ -0,0 +1,38 @@
+# This workflow warns and then closes stale issues and PRs.
+# Docs: https://github.com/actions/stale
+name: Close Stale Issues 
+
+on:
+  schedule:
+    - cron: "17 5 * * 1-5" # run at 5:17 (UTC) on Monday to Friday
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/stale@v8
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          # Handle stale issues
+          stale-issue-label: 'stale'
+          # Exemptions
+          exempt-all-issue-assignees: true
+          exempt-issue-labels: 'support,dependencies,pinned,security'
+          # Mark as stale
+          days-before-issue-stale: 63 # 2 months / 9 weeks
+          stale-issue-message: |
+            This issue has been automatically marked as inactive because it has not had activity in the past two months.
+            
+            If no further activity occurs, this issue will be automatically closed in one week in order to increase our focus on active topics.
+          # Close
+          days-before-issue-close: 7 # 1 week
+          close-issue-message: |
+            This issue has been automatically closed because it has not had recent activity. Thank you for your contributions.
+
+            If the issue has not been resolved, you can [find more information in our Wiki](https://wiki.safing.io/) or [continue the conversation on our Discord](https://discord.gg/safing).
+          # TODO: Handle stale PRs