bundle console assets into server (close #516, close #521, close #2130) (#2192)

This PR builds console static assets into the server docker image at `/srv/console-assets`. When env var `HASURA_GRAPHQL_CONSOLE_ASSETS_DIR=/srv/console-assets` or flag `--console-assets-dir=/srv/console-assets` is set on the server, the files in this directory are served at `/console/assets/*`.

The console html template will have a variable called `cdnAssets: false` when this flag is set and it loads assets from server itself instead of CDN.

The assets are moved to a new bucket with a new naming scheme:

```
graphql-engine-cdn.hasura.io/console/assets/
   /common/{}
   /versioned/<version/{}
   /channel/<channel>/<version>/{}
```

Console served by CLI will still load assets from CDN - will fix that in the next release.

scripts/get-console-assets-version.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+set -eo pipefail
+IFS=$'\n\t'
+
+ROOT="${BASH_SOURCE[0]%/*}"
+
+SEMVER_REGEX="^v(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)\\.(0|[1-9][0-9]*)(\\-[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?(\\+[0-9A-Za-z-]+(\\.[0-9A-Za-z-]+)*)?$"
+LATEST_TAG=$(git describe --tags --abbrev=0)
+
+VERSION=""
+channel="stable"
+
+if [[ "$LATEST_TAG" =~ $SEMVER_REGEX ]]; then
+    major=${BASH_REMATCH[1]}
+    minor=${BASH_REMATCH[2]}
+    release=${BASH_REMATCH[4]}
+    if [[ $release == -alpha* ]]; then channel="alpha"; fi
+    if [[ $release == -beta* ]]; then channel="beta"; fi
+    if [[ $release == -rc* ]]; then channel="rc"; fi
+
+    VERSION="channel/$channel/v$major.$minor"
+fi
+
+if [ -z "$VERSION" ]; then VERSION="versioned/$($ROOT/get-version.sh)"; fi
+
+echo $VERSION

scripts/get-version-circleci.sh

@@ -27,4 +27,4 @@ if [ -z "$VERSION" ]; then VERSION="$($ROOT/get-version.sh)"; fi
 
 VERSION="$(echo $VERSION | tr -cd '[[:alnum:]]._-')"
 
-echo $VERSION
+echo $VERSION