Provide rustc version as a workflow output

action.yml

@@ -7,6 +7,11 @@ inputs:
     description: Rust toolchain specification -- see https://rust-lang.github.io/rustup/concepts/toolchains.html#toolchain-specification
     required: true
 
+outputs:
+  version:
+    description: Version as reported by `rustc --version`
+    value: ${{steps.rustc-version.outputs.version}}
+
 runs:
   using: composite
   steps:
@@ -15,5 +20,8 @@ runs:
       shell: bash
     - run: rustup default ${{inputs.toolchain}}
       shell: bash
+    - id: rustc-version
+      run: echo "::set-output name=version::$(rustc --version)"
+      shell: bash
     - run: rustc --version
       shell: bash