Merge branch 'elliott/validate-rbac-template' into 'master'

Validate RBAC template

See merge request !45

gitlab/validate-sidecar.yml

+.validate-rbac:
+  stage: test
+  # Performs static analysis of RBAC file
+  image: ${SIDECAR_IMAGE}:${SIDECAR_TAG}
+  variables:
+  # Pass in the same variables that would normally be passed to the sidecar in the infrastructure template.
+    ENVOY_CONFIG_FILE: "envoy-with-auth-rbac"    
+    RBAC_FILE: ".infrastructure/rbac.yml"
+    LISTEN_PORT: "5000"
+    SERVICE_DISCOVERY_PORT: "8080"
+    SERVICE_DISCOVERY_ADDRESS: "foo.bar"
+    HEALTHCHECK_PATH: "/health_check"
+    AUTHZ_HOST: "authz.iwoca.aws"
+    AUTHZ_PORT: "10003"
+    ENVOY_MODE: validate
+  script:
+    - export RBAC_ENCODED=$(base64 -w 0 < $RBAC_FILE)
+    - /start-envoy.sh
+  tags:
+    - docker
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