[minimega] copy global VERSION file to lib directory in Docker image

This is in support of rebuilding the minimega Python package in Docker
images based off of this image.

The Python package was updated to require this file in commit 1a428a9.

docker/Dockerfile

@@ -6,15 +6,6 @@ WORKDIR /minimega/
 
 COPY . .
 
-# COPY ./.git     ./.git
-# COPY ./scripts  ./scripts
-# COPY ./cmd      ./cmd
-# COPY ./pkg      ./pkg
-# COPY ./internal ./internal
-# COPY ./packages ./packages
-# COPY ./go.mod   ./go.mod
-# COPY ./go.sum   ./go.sum
-
 RUN ./scripts/all.bash
 
 
@@ -47,8 +38,9 @@ COPY --from=gobuilder /minimega/bin/minirouter    /opt/minimega/bin/minirouter
 # As the minimega API changes, so does the minimega.py generated file. Given
 # this, let's go ahead and also include the lib directory so we can grab the
 # updated Python package from the Docker image.
-COPY --from=gobuilder /minimega/lib    /opt/minimega/lib
-COPY --from=gobuilder /minimega/README /opt/minimega/lib/README
+COPY --from=gobuilder /minimega/lib     /opt/minimega/lib
+COPY --from=gobuilder /minimega/README  /opt/minimega/lib/README
+COPY --from=gobuilder /minimega/VERSION /opt/minimega/lib/VERSION
 
 COPY ./web       /opt/minimega/web
 COPY ./docker/mm /usr/local/bin/mm