chore: Remove mattermost notifications (#2740)

Signed-off-by: Anatolii Bazko <[email protected]>

.github/workflows/release-announce.yml

@@ -10,7 +10,7 @@
 #   Red Hat, Inc. - initial API and implementation
 #
 
-name: Release - announce in mattermost
+name: Release
 on:
   # Trigger the workflow on tag creation only
   push:
@@ -39,17 +39,3 @@ jobs:
           else
             echo "MM_ANNOUNCE=false" >> "$GITHUB_ENV"
           fi
-      - name: Create success MM message
-        run: |
-          echo "{\"text\":\":white_check_mark: Chectl ${{ steps.TAG_UTIL.outputs.chectl_version }} released! https://github.com/che-incubator/chectl/releases${{ steps.TAG_UTIL.outputs.gh_tag }}\"}" > mattermost.json
-      - name: Create failure message
-        if: ${{ failure() }}
-        run: |
-          echo "{\"text\":\":che-logo: Problem with chectl ${{ steps.TAG_UTIL.outputs.chectl_version }} release!\n\n \"}" > mattermost.json
-      - name: Send MM message
-        if: ${{ env.MM_ANNOUNCE == 'true' }}
-        uses: mattermost/[email protected]
-        env:
-          MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_WEBHOOK_URL }}
-          MATTERMOST_CHANNEL: eclipse-che-releases
-          MATTERMOST_USERNAME: che-bot

.github/workflows/release-build-and-push-to-GH-releases.yml

@@ -81,17 +81,3 @@ jobs:
           BRANCH: gh-pages
           FOLDER: gh-pages
           CLEAN: true # Automatically remove deleted files from the deploy branch
-      - name: Create success MM message
-        run: |
-          echo "{\"text\":\":white_check_mark: Chectl ${{ steps.TAG_UTIL.outputs.chectl_version }} released: https://github.com/che-incubator/chectl/releases${{ steps.TAG_UTIL.outputs.gh_tag }}\"}" > mattermost.json
-      - name: Create failure message
-        if: ${{ failure() }}
-        run: |
-          echo "{\"text\":\":che-logo: Problem with chectl ${{ steps.TAG_UTIL.outputs.chectl_version }} release.\n\n \"}" > mattermost.json
-      - name: Send MM message
-        if: ${{ env.MM_ANNOUNCE == 'true' }}
-        uses: mattermost/[email protected]
-        env:
-          MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_WEBHOOK_URL }}
-          MATTERMOST_CHANNEL: eclipse-che-releases
-          MATTERMOST_USERNAME: che-bot

.github/workflows/release.yml

@@ -70,17 +70,4 @@ jobs:
           else
             ./make-release.sh --version ${{ github.event.inputs.version }} --devworkspace-operator-version ${DWO_VERSION}
           fi
-      - name: Create failure MM message
-        if: ${{ failure() }}
-        run: |
-          echo "{\"text\":\":no_entry_sign: Chectl ${{ github.event.inputs.version }} release PR creation failed: https://github.com/che-incubator/chectl/actions/workflows/release.yml\"}" > mattermost.json
-      - name: Create success MM message
-        run: |
-          echo "{\"text\":\":white_check_mark: Chectl ${{ github.event.inputs.version }} release PR has been created: https://github.com/che-incubator/chectl/pulls?q=is%3Aopen+is%3Apr+${{ github.event.inputs.version }}\"}" > mattermost.json
-      - name: Send MM message
-        if: ${{ success() }} || ${{ failure() }}
-        uses: mattermost/[email protected]
-        env:
-          MATTERMOST_WEBHOOK_URL: ${{ secrets.MATTERMOST_WEBHOOK_URL }}
-          MATTERMOST_CHANNEL: eclipse-che-releases
-          MATTERMOST_USERNAME: che-bot
+