sdp-k8s-injector: add simple CLI testing

Full testing requires a k8s environment.

sdp-k8s-injector.yaml

@@ -53,10 +53,35 @@ subpackages:
       - runs: |
           mkdir -p ${{targets.subpkgdir}}/usr/bin/
           mv ${{targets.destdir}}/usr/bin/${{range.key}} ${{targets.subpkgdir}}/usr/bin/
+    test:
+      pipeline:
+        - runs: &write_log4rs_config |
+            cat << 'EOF' > log4rs.yaml
+            appenders:
+              # An appender named "stdout" that writes to stdout
+              stdout:
+                kind: console
+
+            # Set the default logging level to "warn" and attach the "stdout" appender to the root
+            root:
+              level: warn
+              appenders:
+                - stdout
+            EOF
+        - runs: |
+            SDP_LOG_CONFIG_FILE=log4rs.yaml ${{range.key}} --help
 
 update:
   enabled: true
   github:
     identifier: appgate/sdp-k8s-injector
     strip-prefix: v
     strip-suffix: -sdp-k8s-injector-crd
+
+test:
+  pipeline:
+    - runs: *write_log4rs_config
+    - runs: |
+        # sdp-injector expects full valid k8s configuration, so we just check
+        # for the expected error due to its absence
+        SDP_LOG_CONFIG_FILE=log4rs.yaml sdp-injector 2>&1 | grep -q "Unable to infer Kubernetes config:"