feat: add output for action

To chain on from the github action, it's very useful to be able to get
the output from an action.

Signed-off-by: Justin Chadwell <[email protected]>

action.yml

@@ -37,6 +37,10 @@ inputs:
     description: "Whether to stop the Dagger Engine after this run"
     required: false
     default: "true"
+outputs:
+  output:
+    description: "Job output"
+    value: ${{ steps.exec.outputs.stdout }}
 runs:
   using: "composite"
   steps:
@@ -65,17 +69,21 @@ runs:
         curl -fsS https://dl.dagger.io/dagger/install.sh \
         | BIN_DIR=${prefix_dir}/bin DAGGER_VERSION="$VERSION" DAGGER_COMMIT="$COMMIT" sh
 
-    - shell: bash
+    - id: exec
+      shell: bash
       env:
         INPUT_MODULE: ${{ inputs.module }}
       run: |
+        tmpout=$(mktemp)
         cd ${{ inputs.workdir }} && { \
         DAGGER_CLOUD_TOKEN=${{ inputs.cloud-token }} \
         dagger \
         ${{ inputs.dagger-flags }} \
         ${{ inputs.verb }} \
         ${INPUT_MODULE:+-m $INPUT_MODULE} \
-        ${{ inputs.args }}; }
+        ${{ inputs.args }}; } | tee "${tmpout}"
+
+        (echo -n "stdout=" && cat "${tmpout}") >> "$GITHUB_OUTPUT"
 
     - if: inputs.engine-stop == 'true'
       shell: bash