ci: enable TiCS integration (#4855)

- [ ] Have you followed the [guidelines for
contributing](https://github.com/snapcore/snapcraft/blob/master/CONTRIBUTING.md)?
- [ ] Have you signed the
[CLA](http://www.ubuntu.com/legal/contributors/)?
- [ ] Have you successfully run `tox run -m lint`?
- [ ] Have you successfully run `tox run -e test-py310`? (supported
versions: `py39`, `py310`, `py311`, `py312`)

-----
- new tox target for a single coverage result for an easier TiCS
workflow
- Run TiCS on pushes to main

---------

Signed-off-by: Sergio Schvezov <sergio.schvezov@canonical.com>

.github/workflows/tics.yaml

@@ -0,0 +1,40 @@
+name: TICS
+
+on:
+  push:
+    branches:
+    - main
+
+jobs:
+  CI:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          echo "::group::apt-get update"
+          sudo apt-get update
+          echo "::endgroup::"
+          echo "::group::apt-get install..."
+          sudo apt-get install -y libapt-pkg-dev libyaml-dev xdelta3 patchelf
+          echo "::endgroup::"
+          echo "::group::pip install"
+          python -m pip install 'tox<5.0' tox-gh
+          echo "::endgroup::"
+
+      - name: Setup Tox environment
+        run: tox run-parallel --parallel auto --parallel-no-spinner --parallel-live --colored yes -e test-all-py310 --notest
+
+      - name: Test with tox
+        run: tox run --skip-pkg-install --result-json results/tox-py310.json --colored yes -e test-all-py310
+
+      - name: Run TICS analysis
+        uses: tiobe/tics-github-action@v3
+        with:
+          mode: qserver
+          project: snapcraft
+          viewerUrl: https://canonical.tiobe.com/tiobeweb/TICS/api/cfg?name=default
+          ticsAuthToken: ${{ secrets.TICSAUTHTOKEN }}
+          installTics: true

tox.ini

@@ -74,6 +74,14 @@ commands =
     pytest {tty:--color=yes} --cov=snapcraft --cov-report=xml:results/coverage-{env_name}.xml --junit-xml=results/test-results-{env_name}.xml tests/unit {posargs}
     pytest {tty:--color=yes} --junit-xml=results/legacy-test-results-{env_name}.xml tests/legacy {posargs}
 
+[testenv:test-all-py310]
+base = testenv, test
+description = Run all tests with the interpreter used in the snap
+allowlist_externals = mkdir
+commands_pre = mkdir -p results
+commands =
+    pytest {tty:--color=yes} --cov=snapcraft --cov-report=xml:results/coverage-{env_name}.xml --junit-xml=results/test-results-{env_name}.xml tests {posargs}
+
 [lint]  # Standard linting configuration
 package = editable
 extras = dev