[benchmarks] Minor repairs.

Author: petervdonovan

.github/actions/run-benchmarks/action.yml

@@ -66,7 +66,7 @@ runs:
         cd ..
         if [[ -z $EXISTING_FILE ]]; then
           mkdir -p ${{ inputs.repo-for-saving-data }}/$OUTPUT_DIR
-          echo "The collected benchmark results will be saved to $OUTPUT_FILE."
+          echo "The collected benchmark results will be saved to $OUTPUT_DIR/$OUTPUT_FILENAME."
           echo "::set-output name=output-file::$OUTPUT_DIR/$OUTPUT_FILENAME"
         else
           echo "The benchmark will not be run because results for that commit are already saved at $EXISTING_FILE."

.github/actions/visualize-save-upload/action.yml

@@ -61,7 +61,14 @@ runs:
         if [ -f errors.txt ]; then
           ERROR_MESSAGES=$(cat errors.txt)
           echo "The benchmark runner reported the following errors:\n$ERROR_MESSAGES"
-          echo "::set-output name=error-messages::Error messages: $ERROR_MESSAGES"
+          ERROR_MESSAGES=$(cat << EOF
+            Error messages:
+            $ERROR_MESSAGES
+            EOF
+          )
+          echo "ERROR_MESSAGES<<EOF" >> $GITHUB_ENV
+          echo "$ERROR_MESSAGES" >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV
         fi
       shell: bash
 
@@ -70,7 +77,7 @@ runs:
       with:
         message: |
           Running benchmarks from commit ${{ github.sha }}...
-          ${{ steps.compute-error-messages.outputs.error-messages }}
+          ${{ env.ERROR_MESSAGES }}
 
           Results so far:
 
@@ -85,7 +92,7 @@ runs:
       with:
         message: |
           :heavy_check_mark: Finished running benchmarks from ${{ github.sha }}.
-          ${{ steps.compute-error-messages.outputs.error-messages }}
+          ${{ env.ERROR_MESSAGES }}
 
           ![Visualization of the benchmark results.](https://raw.githubusercontent.com/lf-lang/${{ inputs.repo-for-saving-data }}/saved-benchmark-results/${{ steps.figure.outputs.output-file }})
         comment_includes: ${{ github.sha }}