nix: remove subflake

.github/workflows/check.yml

@@ -53,8 +53,6 @@ jobs:
       - name: Run Clippy
         continue-on-error: true
         run: |
-          set -euo pipefail
-
           cargo clippy \
             --all-features \
             --all-targets \

.github/workflows/docker.yml

@@ -26,8 +26,10 @@ jobs:
 
       - name: Build Docker image
         id: build
+        env:
+          ARCH: ${{ matrix.arch }}
         run: |
-          nix build --print-build-logs ./nix/dev#container-${{ matrix.arch }}
+          nix build --print-build-logs .#container-"$ARCH"
           [ ! -L result ] && exit 1
           echo "path=$(readlink -f result)" >> "$GITHUB_OUTPUT"
 

.github/workflows/nix.yml

@@ -49,5 +49,4 @@ jobs:
 
       - name: Run checks
         run: |
-          cd ./nix/dev
           nix flake check --print-build-logs --show-trace

.github/workflows/update-flake.yml

@@ -32,12 +32,6 @@ jobs:
 
       - name: Update flake inputs
         run: |
-          pushd nix/dev
-          nix flake update \
-            --commit-lock-file \
-            --commit-lockfile-summary "nix: update dev flake.lock"
-          popd
-
           nix flake update \
             --commit-lock-file \
             --commit-lockfile-summary "nix: update flake.lock"