Remove unnecessary shell evocations and add debug output

Also magically fixes Gitlab CI issues

.gitlab-ci.yml

@@ -4,7 +4,7 @@ variables:
 build_incremental:
   stage: build
   image: nixpkgs/nix-flakes
-  script: nix shell nixpkgs#zsh --command zsh -c './examples/build_incremental/execute_example.sh'
+  script: pwd; nix shell nixpkgs#zsh --command ./examples/build_incremental/execute_example.sh
   tags:
     - docker
     - kubernetes
@@ -12,7 +12,7 @@ build_incremental:
 build_incremental_nix_legacy:
   stage: build
   image: nixpkgs/nix
-  script: NIX_PATH=nixpkgs=channel:nixos-unstable nix-shell -p zsh --run 'zsh -c ./examples/build_incremental_nix_legacy/execute_example.sh'
+  script: pwd; NIX_PATH=nixpkgs=channel:nixos-unstable nix-shell -p zsh --run ./examples/build_incremental_nix_legacy/execute_example.sh
   tags:
     - docker
     - kubernetes

examples/build_incremental/execute_example.sh

 #!/bin/sh
 
+set -x
 
 # Set the current device and environments
 ./bin/set-device examples/build_incremental/device

examples/build_incremental_nix_legacy/execute_example.sh

 #!/bin/sh
 
+set -x
 
 # Set the current device and environments
 ./bin/set-device examples/build_incremental/device

examples/nix_builder/execute_example.sh

 #!/bin/sh
 
+set -x
+
 cd examples/nix_builder