ci: fix Docker step — add -f docker/Dockerfile and drop invalid --reporter arg

The docker build step was looking for Dockerfile in repo root but it
lives at docker/Dockerfile. Add -f flag to point at the correct path.
Also remove --reporter compact from docker run; that is a Catch2 flag,
not a ctest flag, and the container ENTRYPOINT is ctest.

Signed-off-by: Matt Jones <matt@jellybaby.com>

Signed-off-by: Matt Jones <47545907+SoundMatt@users.noreply.github.com>

Author: SoundMatt

.github/workflows/ci.yml

@@ -377,10 +377,10 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Build Docker image
-        run: docker build --target test -t cpp-lin-test .
+        run: docker build -f docker/Dockerfile --target test -t cpp-lin-test .
 
       - name: Smoke test - run all tests in container
-        run: docker run --rm cpp-lin-test --reporter compact
+        run: docker run --rm cpp-lin-test
 
   sarif:
     name: SARIF upload