Travis: add clean edge script

.travis.yml

@@ -6,10 +6,17 @@ git:
 if: tag != edge
 stages:
   - test
+  - name: clean
+    if: (NOT type IN (pull_request)) AND (branch = master)
   - name: deploy
     if: (NOT type IN (pull_request)) AND (branch = master)
 jobs:
   include:
+    - stage: clean
+      name: Remove Github Release
+      os: linux
+      dist: bionic
+      script: .travis/remove-edge.sh
     - stage: test
       name: macOS
       os: osx

.travis/remove-edge.sh

@@ -0,0 +1,23 @@
+#!/bin/sh -xe
+
+sudo apt-get update -qq
+sudo apt-get -y install jq
+
+old_release=$(curl \
+  -H "Accept: application/vnd.github.v3+json" \
+  https://api.github.com/repos/solvespace/solvespace/releases/tags/edge \
+  | jq -r ".url")
+
+if [ -z "$old_release" ]; then
+  curl \
+    -X DELETE \
+    -H "Accept: application/vnd.github.v3+json" \
+    -H "Authorization: token $GITHUB_TOKEN" \
+    "$old_release"
+fi
+
+curl \
+  -X DELETE \
+  -H "Accept: application/vnd.github.v3+json" \
+  -H "Authorization: token $GITHUB_TOKEN" \
+  https://api.github.com/repos/solvespace/solvespace/git/refs/tags/edge