ci(deploy): prevent docker compose builds in GitHub Actions

Switch CI detection to GITHUB_ACTIONS and disable compose builds via
INFINITO_NO_BUILD=1. The deploy workflows now rely on pulling the prebuilt
CI image instead of triggering local Docker builds.

- Remove legacy UP_BUILD handling
- Enable --no-build in compose when running in real CI
- Keep local/act builds working as before

https://chatgpt.com/share/69666e0b-f08c-800f-93fd-611eced4b100

.github/workflows/test-deploy-server.yml

@@ -41,7 +41,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          make up UP_BUILD=0
+          make up
 
       - name: Discover apps (JSON)
         id: discover
@@ -83,7 +83,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          make up UP_BUILD=0
+          make up
 
       - name: Deploy app
         shell: bash

.github/workflows/test-deploy-universal.yml

@@ -40,7 +40,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          make up UP_BUILD=0
+          make up
 
       - name: Discover apps (JSON)
         id: discover
@@ -82,7 +82,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          make up UP_BUILD=0
+          make up
 
       - name: Deploy app
         shell: bash

.github/workflows/test-deploy-workstation.yml

@@ -1,4 +1,3 @@
-# .github/workflows/test-deploy-workstation.yml
 name: Test Infinito.Nexus Deploy (workstation)
 
 on:
@@ -40,7 +39,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          make up UP_BUILD=0
+          make up
 
       - name: Discover apps (JSON)
         id: discover
@@ -82,7 +81,7 @@ jobs:
         shell: bash
         run: |
           set -euo pipefail
-          make up UP_BUILD=0
+          make up
 
       - name: Deploy app
         shell: bash