chore(workflows): rename staging environment to dev (#2010)

Updated build workflows to use 'dev' instead of 'staging' for environment naming:
- build-distributor.yml
- build-workers.yml
- build-shovel.yml

This aligns the Docker image tagging with the actual development environment name.
Tags will now be 'dev-latest' and 'dev-{sha}' instead of 'staging-latest' and 'staging-{sha}'.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-authored-by: Claude <[email protected]>

Author: 0xBigBoss

.github/workflows/build-distributor.yml

@@ -4,7 +4,7 @@ on:
   workflow_call:
     inputs:
       environment:
-        description: 'Environment name (staging, production)'
+        description: 'Environment name (dev, production)'
         required: true
         type: string
     outputs:
@@ -14,13 +14,13 @@ on:
   workflow_dispatch:
     inputs:
       environment:
-        description: 'Environment name (staging, production)'
+        description: 'Environment name (dev, production)'
         required: true
         type: choice
         options:
-          - staging
+          - dev
           - production
-        default: staging
+        default: dev
 
 jobs:
   build-distributor:

.github/workflows/build-shovel.yml

@@ -4,7 +4,7 @@ on:
   workflow_call:
     inputs:
       environment:
-        description: 'Environment name (staging, production)'
+        description: 'Environment name (dev, production)'
         required: true
         type: string
     outputs:
@@ -14,13 +14,13 @@ on:
   workflow_dispatch:
     inputs:
       environment:
-        description: 'Environment name (staging, production)'
+        description: 'Environment name (dev, production)'
         required: true
         type: choice
         options:
-          - staging
+          - dev
           - production
-        default: staging
+        default: dev
 
 jobs:
   build-shovel:

.github/workflows/build-workers.yml

@@ -4,7 +4,7 @@ on:
   workflow_call:
     inputs:
       environment:
-        description: 'Environment name (staging, production)'
+        description: 'Environment name (dev, production)'
         required: true
         type: string
     outputs:
@@ -14,13 +14,13 @@ on:
   workflow_dispatch:
     inputs:
       environment:
-        description: 'Environment name (staging, production)'
+        description: 'Environment name (dev, production)'
         required: true
         type: choice
         options:
-          - staging
+          - dev
           - production
-        default: staging
+        default: dev
 
 jobs:
   build-workers: