These tests can be run only in our CI environment, and not as pure unit tests
launched by go test ./... Let's make sure that all files that belong to these
tests are properly marked with build constraints.
This should fix the following error in Coverity Scan runs:
# github.com/osbuild/osbuild-composer/cmd/osbuild-auth-tests
runtime.main_main·f: function main is undeclared in the main package
Warning: Build command go build -o bin/ ./... exited with code 2. Please verify that the build completed successfully.
See https://github.com/osbuild/osbuild-composer/runs/4427232580?check_suite_focus=true
Signed-off-by: Ondřej Budai <ondrej@budai.cz>