ci: add monthly TIOBE run (#85)

The Concierge project has been enrolled into Canonical's TIOBE project,
so we can now add a regular run of the TICS tool to submit quality
metrics to TIOBE.

Author: tonyandrewmeyer

.github/workflows/tiobe.yaml

@@ -0,0 +1,45 @@
+name: TIOBE
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron:  '0 7 1 * *'
+
+permissions: {}
+
+jobs:
+  TICS:
+    runs-on: [self-hosted, reactive, amd64, tiobe, noble]
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          persist-credentials: false
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: 'go.mod'
+
+      - name: Install dependencies
+        run: |
+          go install honnef.co/go/tools/cmd/staticcheck@v0.5.1
+          go install github.com/axw/gocov/gocov@v1.1.0
+          go install github.com/AlekSi/gocov-xml@v1.1.0
+
+      # We could store a report from the regular run, but this is cheap to do and keeps this isolated.
+      - name: Test and generate coverage report
+        run: |
+          go test -coverprofile=coverage.out ./...
+          gocov convert coverage.out > coverage.json
+          # Annoyingly, the coverage.xml file needs to be in a .coverage folder.
+          mkdir .coverage
+          gocov-xml < coverage.json > .coverage/coverage.xml
+
+      - name: TICS GitHub Action
+        uses: tiobe/tics-github-action@009979693978bfefad2ad15c1020066694968dc7  # 3.4.0
+        with:
+          mode: qserver
+          viewerUrl: https://canonical.tiobe.com/tiobeweb/TICS/api/cfg?name=GoProjects
+          ticsAuthToken: ${{ secrets.TICSAUTHTOKEN }}
+          project: concierge
+          installTics: true