Merge pull request #7630 from hashicorp/ldflags

circle-ci: add `-ldflags="-s -w"` for smaller go binaries & tag nightly build as a 'pre-release'

.circleci/config.yml

@@ -4,7 +4,7 @@ defaults: &golang
   working_directory: /go/src/github.com/hashicorp/packer
   steps:
     - checkout
-    - run: go build -o ./pkg/packer_$(go env GOOS)_$(go env GOARCH) .
+    - run: go build -ldflags="-s -w" -o ./pkg/packer_$(go env GOOS)_$(go env GOARCH) .
     - run: zip ./pkg/packer_$(go env GOOS)_$(go env GOARCH).zip ./pkg/packer_$(go env GOOS)_$(go env GOARCH)
     - run: rm ./pkg/packer_$(go env GOOS)_$(go env GOARCH)
     - persist_to_workspace:
@@ -67,7 +67,7 @@ jobs:
       - attach_workspace:
           at: .
       - run: |
-          ghr -t ${GITHUB_TOKEN_AZR} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${CIRCLE_TAG} ./pkg/
+          ghr -prerelease -t ${GITHUB_TOKEN_AZR} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${CIRCLE_TAG} ./pkg/
 workflows:
   version: 2
   build_and_check_vendor_vs_module: