Replace Travis CI with Github workflow

.github/calcrom/webhook.sh

@@ -0,0 +1,16 @@
+#!/bin/bash -ex
+
+# Only run this script if it's the master branch build.
+if [[ "$GITHUB_REF" != "refs/heads/master" || "$GITHUB_EVENT_NAME" != "false" ]]; then
+  exit 0
+fi
+
+build_name=$1
+map_file=$build_name.map
+if [ ! -f $map_file ]; then
+  echo "$map_file does not exist!"
+  exit 1
+fi
+
+output=$(perl $(dirname "$0")/calcrom.pl $build_name.map | sed -E ':a;N;$!ba;s/\r{0,1}\n/\\n/g')
+curl -d "{\"username\": \"$CALCROM_DISCORD_WEBHOOK_USERNAME\", \"avatar_url\": \"$CALCROM_DISCORD_WEBHOOK_AVATAR_URL\", \"content\":\"\`\`\`$build_name progress:\\n$output\`\`\`\"}" -H "Content-Type: application/json" -X POST "$CALCROM_DISCORD_WEBHOOK_URL"