github: add checks to prevent unnecessary runs

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

.github/workflows/deploy-to-cloudflare.yml

@@ -7,6 +7,7 @@ on:
 
 jobs:
   deploy-main:
+    if: "contains(github.event.head_commit.message, '[deploy]')"
     runs-on: ubuntu-latest
 
     steps:
@@ -35,6 +36,7 @@ jobs:
           CF_API_TOKEN: ${{ secrets.CF_API_TOKEN }}
 
   deploy-staging:
+    if: "contains(github.event.head_commit.message, '[staging]')"
     runs-on: ubuntu-latest
 
     steps: