refactor CI and Makefile for Nushell installation (!192)

the idea is to make the installation of Nushell easier to maintain, especially regarding versions, currently pinned to `0.95.0`

> successful run on GitHub: [13032726635](https://github.com/dragoon-rs/komodo/actions/runs/13032726635)

this is also to allow easier testing locally with the same Nushell version as in the CI, e.g.
```bash
# install in `~/.local/bin/` and have multiple versions
make install-nu

hash=$(/tmp/nu --no-config-file --commands 'version | get commit_hash')
nu_bin=$"$HOME/.local/bin/nu-$hash"
cp /tmp/nu $nu_bin

make NU=$nu_bin show test
```
or
```bash
# install in the repo and overwrite each time
make NU_DEST=. install-nu
make NU=./nu show test
```

# changelog
- Makefile
  - split the global `.PHONY` rule into _atomic_ rules next to each _phony_ rule
  - define `NU` and `NU_FLAGS` to allow changing which and how Nushell runs
  - define `NU_ARCH`, `NU_VERSION`, `NU_BUILD` and `NU_DEST` for Nushell installation
  - tweak the output of `make show` a bit
  - add `print-%` rules to print `Makefile` variables, e.g. `make print-NU_FLAGS` would print `--no-config-file`
  - add `make install-nu` to replace the ones from the CIs
- GitLab CI
  - use `make install-nu`
  - export `PATH` with `make print-NU_DEST`
- GitHub CI 
  - use `make install-nu` instead of [github.com:hustcer/setup-nu](https://github.com/hustcer/setup-nu)
  - export `PATH` with `make print-NU_DEST` and `GITHUB_ENV`

.github/workflows/ci.yml

@@ -31,11 +31,13 @@ jobs:
           sudo apt update --yes
           sudo apt upgrade --yes
           sudo apt install protobuf-compiler --yes
-      - uses: hustcer/setup-nu@v3
-        with:
-          version: "0.95"
+      - name: Install Nushell
+        run: |
+          # looks like the following PATH export does not work and `NU` still needs to be set for some reason to invoke `make`...
+          echo "PATH=\"$(make print-NU_DEST):$PATH\"" >> $GITHUB_ENV
+          make install-nu
       - name: Show configuration
-        run: make show
+        run: make NU="$(make print-NU_DEST)/nu" show
       - name: Run tests
         run: |
-          make check clippy test example
+          make NU="$(make print-NU_DEST)/nu" check clippy test example

.gitlab-ci.yml

@@ -4,10 +4,6 @@ stages:
   - fmt
   - test
 
-variables:
-  NUSHELL_ARCH: "x86_64-unknown-linux-musl"
-  NUSHELL_VERSION: "0.95.0"
-
 workflow:
   rules:
     - if: $CI_COMMIT_MESSAGE =~ /^(draft|no-ci):/
@@ -31,15 +27,8 @@ test:
     - apt update --yes
     - apt upgrade --yes
     - apt install protobuf-compiler --yes
-
-    - export NUSHELL_BUILD="nu-$NUSHELL_VERSION-$NUSHELL_ARCH"
-    - export PATH="/tmp/:$PATH"
-
-    # install Nushell
-    - curl -fLo /tmp/nu.tar.gz "https://github.com/nushell/nushell/releases/download/$NUSHELL_VERSION/$NUSHELL_BUILD.tar.gz"
-    - tar xvf /tmp/nu.tar.gz --directory /tmp
-    - cp "/tmp/$NUSHELL_BUILD/nu" /tmp/nu
-
+    - export PATH="$(make print-NU_DEST):$PATH"
+    - make install-nu
     - make show
 
   script:

Makefile

-.PHONY: fmt fmt-check check clippy test-rs test-nu test example show doc build-examples
+NU="nu"
+NU_FLAGS="--no-config-file"
+
+NU_ARCH="x86_64-unknown-linux-musl"
+NU_VERSION="0.95.0"
+NU_BUILD="nu-${NU_VERSION}-${NU_ARCH}"
+NU_DEST="/tmp/"
 
 DEFAULT_GOAL: fmt-check check clippy test-rs
 
+.PHONY: fmt-check
 fmt-check:
 	cargo fmt --all -- --check
 
+.PHONY: fmt
 fmt:
 	cargo fmt --all
 
+.PHONY: install-nu
+install-nu:
+	mkdir -p "${NU_DEST}"
+	curl -fLo "${NU_DEST}/nu.tar.gz" "https://github.com/nushell/nushell/releases/download/${NU_VERSION}/${NU_BUILD}.tar.gz"
+	tar xvf "${NU_DEST}/nu.tar.gz" --directory "${NU_DEST}"
+	cp "${NU_DEST}/${NU_BUILD}/nu" "${NU_DEST}/nu"
+
+.PHONY: check
 check:
-	nu scripts/check-nushell-files.nu
+	${NU} ${NU_FLAGS} scripts/check-nushell-files.nu
 	cargo check --workspace --all-targets
 	cargo check --workspace --all-targets --features kzg
 	cargo check --workspace --all-targets --features aplonk
 	cargo check --workspace --all-targets --all-features
 
+.PHONY: clippy
 clippy:
 	cargo clippy --workspace --all-targets --all-features -- -D warnings
 
+.PHONY: test-rs
 test-rs:
 	cargo test --workspace --verbose --all-features
 	cargo test --examples --verbose
 
+.PHONY: test-nu
 test-nu:
-	nu bins/saclin/tests/cli.nu
-	nu bins/saclin/tests/binary.nu
+	${NU} ${NU_FLAGS} bins/saclin/tests/cli.nu
+	${NU} ${NU_FLAGS} bins/saclin/tests/binary.nu
 
+.PHONY: test
 test: test-rs test-nu
 
+.PHONY: example
 example:
-	nu bins/saclin/examples/cli.nu
+	${NU} ${NU_FLAGS} bins/saclin/examples/cli.nu
 
+.PHONY: show
 show:
-	rustup --version
-	rustup show --verbose
-	rustc --version
-	cargo --version
-	cargo clippy --version
-	nu --version
+	@rustup --version 2> /dev/null
+	@rustup show active-toolchain
+	@rustc --version
+	@cargo --version
+	@cargo clippy --version
+	@${NU} ${NU_FLAGS} --commands "version"
 
+.PHONY: doc
 doc:
 	cargo doc --document-private-items --no-deps --open
 
+.PHONY: build-examples
 build-examples:
 	cargo build --examples --release
+
+print-%:
+	@echo $($*)