feat(docker): Build multiple python version images (#22770)

Co-authored-by: Daniel Draper <daniel.draper@understand.ai>

.github/workflows/docker_build_push.sh

@@ -50,12 +50,27 @@ docker build --target lean \
   -t "${REPO_NAME}:${SHA}" \
   -t "${REPO_NAME}:${REFSPEC}" \
   -t "${REPO_NAME}:${LATEST_TAG}" \
+  --build-arg PY_VER="3.8-slim"\
   --label "sha=${SHA}" \
   --label "built_at=$(date)" \
   --label "target=lean" \
   --label "build_actor=${GITHUB_ACTOR}" \
   .
 
+#
+# Build the "lean39" image
+#
+docker build --target lean \
+  -t "${REPO_NAME}:${SHA}-py39" \
+  -t "${REPO_NAME}:${REFSPEC}-py39" \
+  -t "${REPO_NAME}:${LATEST_TAG}-py39" \
+  --build-arg PY_VER="3.9-slim"\
+  --label "sha=${SHA}" \
+  --label "built_at=$(date)" \
+  --label "target=lean39" \
+  --label "build_actor=${GITHUB_ACTOR}" \
+  .
+
 #
 # Build the "websocket" image
 #
@@ -65,7 +80,7 @@ docker build \
   -t "${REPO_NAME}:${LATEST_TAG}-websocket" \
   --label "sha=${SHA}" \
   --label "built_at=$(date)" \
-  --label "target=lean" \
+  --label "target=websocket" \
   --label "build_actor=${GITHUB_ACTOR}" \
   superset-websocket