updated dockerfiles and READMEs to v0.4.0

containers/agent/Dockerfile

@@ -18,7 +18,7 @@ RUN go mod tidy && go build -o /app/mrvaagent-binary
 # RUN go mod download
 
 # Create a runtime container
-FROM ubuntu:24.10 as runner
+FROM ubuntu:24.10 AS runner
 ENV DEBIAN_FRONTEND=noninteractive
 
 # Build argument for CodeQL version, defaulting to the latest release

containers/agent/README.org

@@ -19,7 +19,9 @@
 
   - Tag the container.  This is sufficient for further use on the local machine.
     #+BEGIN_SRC sh
-      docker tag ${MAG_TARGET} ghcr.io/hohn/mrva-agent:0.4.0
+      cd ~/work-gh/mrva/mrva-docker/containers/agent &&\
+          docker tag mrva-agent:0.4.0 \
+                 ghcr.io/hohn/mrva-agent:0.4.0
     #+END_SRC
 
   - Push this container