ci: re-enable unit and integration tests

All installer test failures have been resolved. Re-enabling the full test
suite now that the install.sh script works correctly in Docker containers.

Installer tests are now passing on all platforms:
- debian:12 ✓
- debian:trixie ✓
- ubuntu:22.04 ✓
- ubuntu:24.04 ✓
- archlinux:latest ✓

.github/workflows/test.yml

@@ -10,7 +10,6 @@ jobs:
   unit-tests:
     name: Unit Tests
     runs-on: ubuntu-latest
-    if: false  # Temporarily disabled to save CI minutes while troubleshooting installer tests
 
     strategy:
       matrix:
@@ -62,7 +61,6 @@ jobs:
   integration-tests:
     name: Integration Tests
     runs-on: ubuntu-latest
-    if: false  # Temporarily disabled to save CI minutes while troubleshooting installer tests
 
     strategy:
       matrix: