Add script to automatically create charm tracks

The tracks are looked up from zuul.d/zuul.yaml. Changes these tracks
before running the script.

This script will check if the track exists before creating it.

Change-Id: If3fd2910319970f63608350ea43c3c2ab6c77ffc

create_tracks.sh

@@ -0,0 +1,65 @@
+#!/bin/bash
+
+# This script look inside publish_channels for all tracks that should exits.
+# If the track does not exist, it creates it.
+
+if ! command -v charmcraft &> /dev/null
+then
+    echo "charmcraft could not be found"
+    echo "Install it with: snap install charmcraft --classic"
+    exit 1
+fi
+
+if ! command -v yq &> /dev/null
+then
+    echo "yq could not be found"
+    echo "Install it with: snap install yq"
+    exit 1
+fi
+
+if ! command -v jq &> /dev/null
+then
+    echo "jq could not be found"
+    echo "Install it with: snap install jq"
+    exit 1
+fi
+
+if ! command -v curl &> /dev/null
+then
+    echo "curl could not be found"
+    echo "Install it with: apt install curl"
+    exit 1
+fi
+
+opt_charm=""
+
+publish_channel=$(yq -r '.[0].project.vars.publish_channels | to_entries | .[] | (.key + " " + .value)' zuul.d/zuul.yaml)
+
+while IFS=' ' read -r charm _; do
+    opt_charm="$opt_charm --charm=$charm"
+done < <(echo "$publish_channel")
+
+
+charmcraft login --export=sunbeam-charms.auth \
+    $opt_charm \
+    --permission=package-view-metadata \
+    --permission=package-manage-metadata \
+    --ttl=3600
+
+CHARMHUB_MACAROON_HEADER="Authorization: Macaroon $(cat sunbeam-charms.auth | base64 -d | jq -r .v)"
+
+while IFS=' ' read -r charm channel; do
+    track=$(echo "$channel" | cut -d'/' -f1)
+    url=https://api.charmhub.io/v1/charm/$charm
+    metadata=$(curl -s "$url" -H'Content-type: application/json' -H "$CHARMHUB_MACAROON_HEADER")
+    tracks=$(echo "$metadata" | jq -r '.metadata.tracks[].name')
+    if [[ $tracks =~ $track ]]; then
+        echo "Track $track already exists for charm $charm"
+    else
+        echo "Creating track $track for charm $charm"
+        curl -s "$url/tracks" -X POST -H'Content-type: application/json' -H "$CHARMHUB_MACAROON_HEADER" -d '[{"name": "'"$track"'"}]'
+    fi
+done < <(echo "$publish_channel")
+
+# Clean the created files
+rm sunbeam-charms.*