ci: add support for actionlint (#4575)

Co-authored-by: devtools-ci-cd <developer-tools-team@scaleway.com>

Author: remyleone

.github/workflows/actionlint.yml

@@ -0,0 +1,12 @@
+name: Lint GitHub Actions workflows
+on: [push, pull_request]
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Check workflow files
+        uses: docker://rhysd/actionlint:latest
+        with:
+          args: -color -ignore SC2086

.github/workflows/announce.yml

@@ -27,7 +27,7 @@ jobs:
         id: announce_slack
         run: |
           readarray -td' ' URL_LIST <<<$SLACK_WEBHOOKS; 
-          for WEBHOOK_URL in ${URL_LIST[@]};
+          for WEBHOOK_URL in "${URL_LIST[@]}";
           do curl -X POST -H 'Content-type: application/json' \
           --data '{
           	"blocks": [

.github/workflows/deploy-docs.yml

@@ -4,8 +4,6 @@ on:
   release:
     types:
       - published # Triggered only when a new release is published
-    branches:
-      - master
 permissions:
   contents: write
 jobs: