tweak message (#29)

* send mm announcement to https://mattermost.eclipse.org/eclipse/channels/eclipse-che-releases

Change-Id: I490c5f4a9e0757d3a163ac6a85debaee8e24f13a
Signed-off-by: nickboldt <nboldt@redhat.com>

* tweak message

Change-Id: Iab4c4f6334c246f1f5d399b3aa0ec3aa4c1f4e0b
Signed-off-by: nickboldt <nboldt@redhat.com>

* tweak workflow

Change-Id: I207226750ec9455c38eccb94cd580fdf12d483ac
Signed-off-by: nickboldt <nboldt@redhat.com>

.github/workflows/release-send-mattermost-announcement.yml

@@ -1,5 +1,5 @@
 # This Workflow announces a release in Eclipse Mattermost to https://mattermost.eclipse.org/eclipse/channels/eclipse-che-releases
-name: Release - Send announcement to https://mattermost.eclipse.org/eclipse/channels/eclipse-che-releases
+name: Release - Send eclipse-che-releases announcement
 on:
   workflow_dispatch:
     inputs:
@@ -9,20 +9,16 @@ on:
         default: ''
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-    - name: Setup env vars
-      id: ENVS
+    - name: Create message
       run: |
-        echo "::set-output name=base_version::${version%.*}" 
-    - name: Create Mattermost message
-      run: |
-        echo "{\"text\":\"Che ${{ github.event.inputs.version }} has been released. Please resolve or move unresolved issues assigned to this milestone: https://github.com/eclipse/che/milestones/${{ steps.ENVS.outputs.base_version }}\"}" > mattermost.json
-    - name: Send Mattermost message
+        milestone=${{ github.event.inputs.version }}
+        milestone=${milestone%.*}; echo "milestone: ${milestone}"
+        echo "{\"text\":\":che-logo: Che ${{ github.event.inputs.version }} has been released.\n\nPlease resolve or move unresolved issues assigned to this milestone: https://github.com/eclipse/che/milestones/${milestone}\"}" > mattermost.json
+    - name: Send message
       uses: mattermost/action-mattermost-notify@master
       env:
         MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_WEBHOOK_URL }}
         MATTERMOST_CHANNEL: eclipse-che-releases
-        MATTERMOST_ICON: che-logo
-        MATTERMOST_USERNAME: nboldt
-
+        MATTERMOST_USERNAME: che-bot