.github: add actions and issue templates

Author: tulir

.github/ISSUE_TEMPLATE/bug.md

@@ -0,0 +1,16 @@
+---
+name: Bug report
+about: If something is definitely wrong in the bridge (rather than just a setup issue),
+  file a bug report. Remember to include relevant logs. Asking in the Matrix room first
+  is strongly recommended.
+type: Bug
+
+---
+
+<!--
+Remember to include relevant logs, the bridge version and any other details.
+
+It's always best to ask in the Matrix room first, especially if you aren't sure
+what details are needed. Issues with insufficient detail will likely just be
+ignored or closed immediately.
+-->

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: Troubleshooting docs & FAQ
+    url: https://docs.mau.fi/bridges/general/troubleshooting.html
+    about: Check this first if you're having problems setting up the bridge.
+  - name: Support room
+    url: https://matrix.to/#/#zulip:maunium.net
+    about: For setup issues not answered by the troubleshooting docs, ask in the Matrix room.

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement request
+about: Submit a feature request or other suggestion
+type: Feature
+
+---

.github/workflows/go.yml

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+name: Go
+
+on: [push, pull_request]
+
+env:
+  GOTOOLCHAIN: local
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        go-version: ["1.25"]
+    name: Lint ${{ matrix.go-version == '1.25' && '(latest)' || '(old)' }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: ${{ matrix.go-version }}
+          cache: true
+
+      - name: Install libolm
+        run: sudo apt-get install libolm-dev libolm3
+
+      - name: Install dependencies
+        run: |
+          go install golang.org/x/tools/cmd/goimports@latest
+          go install honnef.co/go/tools/cmd/staticcheck@latest
+          export PATH="$HOME/go/bin:$PATH"
+
+      - name: Run pre-commit
+        uses: pre-commit/action@v3.0.1

.github/workflows/stale.yml

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+name: 'Lock old issues'
+
+on:
+  schedule:
+    - cron: '0 9 * * *'
+  workflow_dispatch:
+
+permissions:
+  issues: write
+#  pull-requests: write
+#  discussions: write
+
+concurrency:
+  group: lock-threads
+
+jobs:
+  lock-stale:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v5
+        id: lock
+        with:
+          issue-inactive-days: 90
+          process-only: issues
+      - name: Log processed threads
+        run: |
+          if [ '${{ steps.lock.outputs.issues }}' ]; then
+            echo "Issues:" && echo '${{ steps.lock.outputs.issues }}' | jq -r '.[] | "https://github.com/\(.owner)/\(.repo)/issues/\(.issue_number)"'
+          fi