[ci skip] Apply additional tags, base image only to start

* python-<version>
* notebook-<version>
* lab-<version>
* hub-<version>

base-notebook/hooks/apply_tags

+#!/bin/bash
+set -e
+
+# Tag the latest build with the short git sha as well as version of key runtimes
+# and packages. 
+GIT_SHA_TAG=${SOURCE_COMMIT:0:12}
+docker tag $IMAGE_NAME "$DOCKER_REPO:$GIT_SHA_TAG"
+PY_VERSION_TAG="python-$(docker run --rm ${IMAGE_NAME} python --version 2>&1 | awk '{print $2}')"
+docker tag $IMAGE_NAME "$DOCKER_REPO:$PY_VERSION_TAG"
+NB_VERSION_TAG="notebook-$(docker run --rm -a STDOUT ${IMAGE_NAME} jupyter-notebook --version | tr -d '\r')"
+docker tag $IMAGE_NAME "$DOCKER_REPO:${NB_VERSION_TAG%% }"
+LAB_VERSION_TAG="lab-$(docker run --rm -a STDOUT ${IMAGE_NAME} jupyter-lab --version | tr -d '\r')"
+docker tag $IMAGE_NAME "$DOCKER_REPO:${LAB_VERSION_TAG%%\r}"
+HUB_VERSION_TAG="hub-$(docker run --rm -a STDOUT ${IMAGE_NAME} jupyterhub --version | tr -d '\r')"
+docker tag $IMAGE_NAME "$DOCKER_REPO:${HUB_VERSION_TAG%%\r}"
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base-notebook/hooks/index.tmpl

-INDEX_ROW="|\`${BUILD_TIMESTAMP}\`|\`jupyter/${IMAGE_SHORT_NAME}:${GIT_SHA_TAG}\`|[Git diff](https://github.com/jupyter/docker-stacks/commit/${SOURCE_COMMIT})<br />[Dockerfile](https://github.com/jupyter/docker-stacks/blob/${SOURCE_COMMIT}/${IMAGE_SHORT_NAME}/Dockerfile)<br />[Build manifest](./${IMAGE_SHORT_NAME}-${GIT_SHA_TAG})|"
+INDEX_ROW="|\`${BUILD_TIMESTAMP}\`|\`jupyter/${IMAGE_SHORT_NAME}:${GIT_SHA_TAG}\`<br />\`jupyter/${IMAGE_SHORT_NAME}:${PY_VERSION_TAG}\`<br />\`jupyter/${IMAGE_SHORT_NAME}:${NB_VERSION_TAG}\`<br />\`jupyter/${IMAGE_SHORT_NAME}:${LAB_VERSION_TAG}\`<br />\`jupyter/${IMAGE_SHORT_NAME}:${HUB_VERSION_TAG}\`|[Git diff](https://github.com/jupyter/docker-stacks/commit/${SOURCE_COMMIT})<br />[Dockerfile](https://github.com/jupyter/docker-stacks/blob/${SOURCE_COMMIT}/${IMAGE_SHORT_NAME}/Dockerfile)<br />[Build manifest](./${IMAGE_SHORT_NAME}-${GIT_SHA_TAG})|"
 sed "/|-|/a ${INDEX_ROW}" -i "$INDEX_FILE"
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base-notebook/hooks/post_push

 #!/bin/bash
 set -e
 
-# Tag the latest build with the short git sha. Push the tag in addition
-# to the "latest" tag already pushed.
-GIT_SHA_TAG=${SOURCE_COMMIT:0:12}
-docker tag $IMAGE_NAME $DOCKER_REPO:$GIT_SHA_TAG
-docker push $DOCKER_REPO:$GIT_SHA_TAG
+# Apply and push all tags
+source hooks/apply_tags
+docker push $DOCKER_REPO
 
 # Create a working directory.
 BUILD_TIMESTAMP=$(date -u +%FT%TZ)