chore(lint): add yaml schema to workflows

.github/workflows/composer-install.yml

@@ -1,4 +1,5 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 name: Run Composer Install
 
 on:

.github/workflows/compress-images.yml

@@ -1,4 +1,6 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+#
 # Compress images on demand (workflow_dispatch), and at 11pm every Sunday (schedule).
 # Open a Pull Request if any images can be compressed.
 name: Compress Images on Demand

.github/workflows/dependency-review.yml

@@ -1,4 +1,6 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
+#
 # Dependency Review Action
 #
 # This Action will scan dependency manifest files that change as part of a Pull Request,

.github/workflows/laravel-phpunit.yml

@@ -1,4 +1,5 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 name: Laravel Setup and Composer test
 
 on:

.github/workflows/pr-compress-images.yml

@@ -1,4 +1,5 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 name: Compress Images
 
 on:

.github/workflows/release-drafter.yml

@@ -1,4 +1,5 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 name: Release Drafter
 
 on:

.github/workflows/reviewdog-linters.yml

@@ -1,4 +1,5 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 name: Reviewdog Linters
 
 on: [pull_request]

.github/workflows/sync-labels-to-own-projects.yml

@@ -1,4 +1,5 @@
 ---
+# yaml-language-server: $schema=https://json.schemastore.org/github-workflow.json
 name: Sync labels to other repositories
 
 on: