chore: add example environment file and update deployment workflows

.github/pull_request_template.yaml

@@ -0,0 +1,4 @@
+---
+labels:
+  - skip-ci
+---

.github/workflows/deploy-preview.yml

@@ -12,6 +12,7 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-ci')"
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/deploy.yml

@@ -12,6 +12,7 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    if: "!contains(github.event.pull_request.labels.*.name, 'skip-ci')"
 
     steps:
       - uses: actions/checkout@v4