ci: Set bash as the default shell for actions that use it

Author: anaxite

.github/workflows/deploy-preview.yml

@@ -6,7 +6,9 @@ on:
       - main
     # Review gh actions docs if you want to further define triggers, paths, etc
     # https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#on
-
+defaults:
+  run:
+    shell: bash
 jobs:
   build:
     name: Test deployment

.github/workflows/deploy.yml

@@ -7,14 +7,16 @@ on:
   # repository_dispatch:  # TODO: Configure repository_dispatch event in update-common.yml
   #   types:
   #     - update-common-package-complete
-
+defaults:
+  run:
+    shell: bash
 jobs:
   build:
     name: Build Docusaurus
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 #v6.0.0
-      
+
       - uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 #v6.0.0
         with:
           cache: npm

.github/workflows/update-common.yml

@@ -10,7 +10,9 @@ on:
         description: 'The doc-detective-common version.'
         required: false
         default: 'latest'
-
+defaults:
+  run:
+    shell: bash
 jobs:
   update:
     permissions: