fix: AICA image metadata base version as git tag, not ROS distro

* Change tech.aica.image.metadata base.version to use VERSION
(expected as semver vX.Y.Z-foo) instead of BASE_TAG (which was
equiavlent to ROS distro (i.e iron). Otherwise, package-builder:v1
will fail to parse the metadata since it expects the base version
as a semver string

ros2_ws/Dockerfile

@@ -149,4 +149,4 @@ LABEL org.opencontainers.image.title="AICA ROS 2 image"
 LABEL org.opencontainers.image.description="AICA base ROS 2 image (includes ros2_control)"
 LABEL org.opencontainers.image.version="${VERSION}"
 LABEL org.opencontainers.image.base.name="docker.io/library/ros:${BASE_TAG}"
-LABEL tech.aica.image.metadata='{"type":"base/ws","base":{"name":"docker.io/library/ros","version":"'${BASE_TAG}'"}}'
+LABEL tech.aica.image.metadata='{"type":"base/ws","base":{"name":"docker.io/library/ros","version":"${VERSION}"}}'