tools: do not hardcode yamllint path

Allows user to get `yamlllint` from other source than Pip (e.g. Nix).

Signed-off-by: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: aduh95

Makefile

@@ -3,6 +3,7 @@
 BUILDTYPE ?= Release
 PYTHON ?= python3
 RUFF ?= tools/pip/site-packages/bin/ruff
+YAMLLINT ?= tools/pip/site-packages/bin/yamllint
 DESTDIR ?=
 SIGN ?=
 PREFIX ?= /usr/local
@@ -1719,14 +1720,15 @@ lint-yaml-build: ## Build resources needed to lint YAML files.
 		$(PYTHON) -m pip install --upgrade --system -t tools/pip/site-packages yamllint
 
 .PHONY: lint-yaml
+ifneq ("","$(wildcard $(YAMLLINT))")
 lint-yaml: ## Lint the YAML files with yamllint.
-	@if [ -d "tools/pip/site-packages/yamllint" ]; then \
-			$(info Running YAML linter...) \
-			PYTHONPATH=tools/pip $(PYTHON) -m yamllint .; \
-	else \
-		echo 'YAML linting with yamllint is not available'; \
-		echo "Run 'make lint-yaml-build'"; \
-	fi
+	$(info Running YAML linter...)
+	$(YAMLLINT) .
+else
+lint-yaml:
+	$(warning YAML linting with yamllint is not available)
+	$(warning Run 'make lint-yaml-build')
+endif
 
 .PHONY: lint
 .PHONY: lint-ci

shell.nix

@@ -149,6 +149,14 @@ pkgs.mkShell {
       RUFF = pkgs.lib.getExe ruff;
     }
   )
+  // (
+    let
+      yamllint = pkgs.lib.lists.findFirst (p: p.meta.mainProgram == "yamllint") null devTools;
+    in
+    pkgs.lib.optionalAttrs (yamllint != null) {
+      YAMLLINT = pkgs.lib.getExe yamllint;
+    }
+  )
   // pkgs.lib.optionalAttrs (!withSQLite) {
     NOSQLITE = "1";
   }

tools/nix/devTools.nix

@@ -9,6 +9,7 @@
   pkgs.jq
   pkgs.ruff
   pkgs.shellcheck
+  pkgs.yamllint
 ]
 ++ (
   if (ncu-path == null) then