opentelemetry-collector: fail the build if we can't fetch build manifest

Previously we would build with a configuration file containing "404 Not
Found" (which was, surprisingly, mostly successful).

opentelemetry-collector.yaml

@@ -22,7 +22,7 @@ pipeline:
       # https://github.com/open-telemetry/opentelemetry-collector-releases/blob/main/distributions/otelcol/manifest.yaml
       # The manifest is updated as part of the release process and so should match the
       # lastest version released from open-telemetry/opentelemetry-collector
-      curl -o builder-config.yaml https://raw.githubusercontent.com/open-telemetry/opentelemetry-collector-releases/v${{package.version}}/distributions/otelcol/manifest.yaml
+      curl --fail -o builder-config.yaml https://raw.githubusercontent.com/open-telemetry/opentelemetry-collector-releases/v${{package.version}}/distributions/otelcol/manifest.yaml
 
   - uses: git-checkout
     with: