ci: switch nix-flake-test job from matrix to sequential steps

Remove the strategy matrix from the nix-flake-test job and replace it with
individual steps for each quality check (test, typecheck, lint, format,
test:e2e). This changes the execution from parallel matrix jobs to
sequential steps in a single job.

Author: MBanucu

.github/workflows/ci.yml

@@ -58,10 +58,6 @@ jobs:
         uses: actions/dependency-review-action@v4
 
   nix-flake-test:
-    strategy:
-      fail-fast: false
-      matrix:
-        quality: [test, typecheck, lint, format, test:e2e]
     name: Devenv CI
     runs-on: ubuntu-latest
     permissions:
@@ -89,4 +85,12 @@ jobs:
         run: devenv shell -- bun build:prod
 
       - name: Quality checks (Devenv shell)
-        run: devenv shell -- bun ${{matrix.quality}}
+        run: devenv shell -- bun test
+      - name: Quality checks (Devenv shell)
+        run: devenv shell -- bun typecheck
+      - name: Quality checks (Devenv shell)
+        run: devenv shell -- bun lint
+      - name: Quality checks (Devenv shell)
+        run: devenv shell -- bun format
+      - name: Quality checks (Devenv shell)
+        run: devenv shell -- bun test:e2e