feat: allow to set an extra message

Change-Id: I7499bc98c492d3dccad62c1682f3080121bb1c2b

action.yml

@@ -11,6 +11,9 @@ inputs:
   message:
     description: message to post on Slack
     default: ""
+  extra_message:
+    description: message to append to autogenerate message
+    default: ""
   job_url:
     description: deprecated not used anymore
     default: ""
@@ -59,6 +62,7 @@ runs:
         JOB_STATUS: ${{ job.status }}
         REF_NAME: ${{ github.ref_name }}
         OVERRIDE_JOB_STATUS: ${{ inputs.OVERRIDE_JOB_STATUS }}
+        EXTRA_MESSAGE: ${{ inputs.extra_message }}
       run: |
         if [ "${OVERRIDE_JOB_STATUS}" ]; then
           JOB_STATUS="${OVERRIDE_JOB_STATUS}"
@@ -90,6 +94,7 @@ runs:
           SLACK_TEXT_MESSAGE=$(cat <<EOF
         *Release (${JOB_ID}) of $PROJECT ${REF_NAME} finished ${emoji}*
         Conclusion: ${JOB_STATUS}
+        ${EXTRA_MESSAGE}
         EOF
         )
 
@@ -104,12 +109,14 @@ runs:
         \`\`\`
         $(git log -1 | sed -e 's/```/~~~/g')
         \`\`\`
+        ${EXTRA_MESSAGE}
         EOF
         )
           else
             SLACK_TEXT_MESSAGE=$(cat <<EOF
         *Deployment ($JOB_ID) of $PROJECT finished ${emoji}*
         Conclusion: ${JOB_STATUS}
+        ${EXTRA_MESSAGE}
         EOF
         )
           fi