chore: Add yamllint to make all (open-telemetry#1707)

* chore: Add yamllint to `make all`

* Fix makefile syntax

---------

Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

Author: CodePrometheus

CHANGELOG.md

@@ -9,6 +9,8 @@ the release.
 
 * [accountingservice] allow running the container with non root user
   ([#1692](https://github.com/open-telemetry/opentelemetry-demo/pull/1692))
+* [chore] Add yamllint to `make all`
+  ([#1707](https://github.com/open-telemetry/opentelemetry-demo/pull/1707))
 
 ## 1.11.1
 

Makefile

@@ -16,10 +16,10 @@ DOCKER_COMPOSE_ENV=--env-file .env --env-file .env.override
 # see https://github.com/open-telemetry/build-tools/releases for semconvgen updates
 # Keep links in semantic_conventions/README.md and .vscode/settings.json in sync!
 SEMCONVGEN_VERSION=0.11.0
+YAMLLINT_VERSION=1.30.0
 
-# TODO: add `yamllint` step to `all` after making sure it works on Mac.
 .PHONY: all
-all: install-tools markdownlint misspell
+all: install-tools markdownlint misspell yamllint
 
 $(MISSPELL):
 	cd $(TOOLS_DIR) && go build -o $(MISSPELL_BINARY) github.com/client9/misspell/cmd/misspell
@@ -44,10 +44,10 @@ markdownlint:
 .PHONY: install-yamllint
 install-yamllint:
     # Using a venv is recommended
-	pip install -U yamllint~=1.30.0
+	yamllint --version >/dev/null 2>&1 || pip install -U yamllint~=$(YAMLLINT_VERSION)
 
 .PHONY: yamllint
-yamllint:
+yamllint: install-yamllint
 	yamllint .
 
 .PHONY: checklicense