add drone cicd

.drone.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# disable CGO for cross-compiling
+export CGO_ENABLED=0
+
+export now=$(TZ=Australia/Sydney date '+%Y%m%d-%H%M%S')
+echo $now
+echo "build commences"
+go build -ldflags "-X main.sha1ver=`git rev-parse HEAD` -X main.buildTime=$now" -o vctp cmd/api/main.go
+echo "build complete"
+sha256sum vctp > vctp_checksum.txt
+ls -lah