fix(ci): correctly set version when building (#15)

Author: Akash Satheesan

.github/workflows/release.yaml

@@ -25,7 +25,7 @@ jobs:
       with:
         go-version: '^1.15'
 
-    - run: go build -v -o cloud-agent-$GOOS-$GOARCH
+    - run: go build -v -o cloud-agent-$GOOS-$GOARCH -ldflags "-X go.coder.com/cloud-agent/internal/version.Version=$(echo $GITHUB_REF | cut -d/ -f3)"
 
     - run: gh release upload $(echo $GITHUB_REF | cut -d/ -f3) ./cloud-agent-$GOOS-$GOARCH
       env: