Update deb/rpm signing (open-telemetry#1892)

* Update deb/rpm signing

* Exclude release scripts from github workflow

Author: jeffreyc-splunk

.github/workflows/build-and-test.yml

@@ -16,6 +16,7 @@ on:
       - 'go.sum'
       - '!**.md'
       - '!internal/buildscripts/packaging/tests/deployments/**'
+      - '!internal/buildscripts/packaging/release/**'
 
 concurrency:
   group: build-and-test-${{ github.event.pull_request.number || github.ref }}