Verify packages in workspace member directories

Running cargo --no-verify in the root of the workspace checks packaging
of all workspace members, including the examples.
We do not currently (and have no intention to) publish the examples,
however. As such, let's verify only the members that we intend to
publish. Also make use of Cargo's --package argument for the package and
publish sub-commands we use, as that minimizes hard coded paths.

Signed-off-by: Daniel Müller <[email protected]>

.github/workflows/publish.yml

@@ -39,7 +39,7 @@ jobs:
         toolchain: stable
         override: true
     - name: Dry-run package creation
-      run: cargo package --no-verify
+      run: cargo package --package libbpf-rs --package libbpf-cargo --locked --no-verify
     - name: Create git tag
       env:
         version: ${{ needs.version.outputs.version }}