chore(linux): Improve output of API Verification

- remove useless branch name from name (this is always `master` due to
  the way the workflow gets triggered)
- add PR# to step summary so that it's visible on the Summary page
- fix PR check message to say "API verification" instead of "Package build"

.github/workflows/api-verification.yml

@@ -1,5 +1,4 @@
 name: "API Verification"
-run-name: "API Verification for ${{ github.ref_name }}"
 on:
  workflow_run:
     workflows: [Ubuntu packaging]
@@ -68,6 +67,8 @@ jobs:
 
     - name: "Verify API for libkeymancore*.so (${{ steps.environment_step.outputs.GIT_BRANCH }}, branch ${{ steps.environment_step.outputs.GIT_BASE_BRANCH }}, by ${{ steps.environment_step.outputs.GIT_USER }})"
       run: |
+        echo "Verify API for libkeymancore*.so (${{ steps.environment_step.outputs.GIT_BRANCH }}, branch ${{ steps.environment_step.outputs.GIT_BASE_BRANCH }}, by ${{ steps.environment_step.outputs.GIT_USER }})" >> $GITHUB_STEP_SUMMARY
+
         BIN_PACKAGE=$(ls "${GITHUB_WORKSPACE}/artifacts/" | grep "${PKG_NAME}[0-9]*_${{ steps.environment_step.outputs.VERSION }}-1${{ steps.environment_step.outputs.PRERELEASE_TAG }}+$(lsb_release -c -s)1_amd64.deb")
         cd ${{ github.workspace }}/keyman/linux
         ./scripts/deb-packaging.sh \
@@ -94,19 +95,19 @@ jobs:
       if: needs.api_verification.result == 'success'
       run: |
         echo "RESULT=success" >> $GITHUB_ENV
-        echo "MSG=Package build succeeded" >> $GITHUB_ENV
+        echo "MSG=API verification succeeded" >> $GITHUB_ENV
 
     - name: Set cancelled
       if: needs.api_verification.result == 'cancelled'
       run: |
         echo "RESULT=error" >> $GITHUB_ENV
-        echo "MSG=Package build cancelled" >> $GITHUB_ENV
+        echo "MSG=API verification cancelled" >> $GITHUB_ENV
 
     - name: Set failure
       if: needs.api_verification.result == 'failure'
       run: |
         echo "RESULT=failure" >> $GITHUB_ENV
-        echo "MSG=Package build failed" >> $GITHUB_ENV
+        echo "MSG=API verification failed" >> $GITHUB_ENV
 
     - name: Set final status
       run: |