*: add docs formatter and checker

Signed-off-by: Paweł Krupa (paulfantom) <pawel@krupa.net.pl>

.github/workflows/go.yml

@@ -85,3 +85,19 @@ jobs:
         go generate ./...
         git diff --exit-code
 
+  docs:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v3
+
+    - name: Set up Go ${{ env.golang-version }}
+      uses: actions/setup-go@v3.0.0
+      with:
+        go-version: ${{ env.golang-version }}
+
+    - name: download mdox
+      run: go install -a github.com/bwplotka/mdox@latest
+
+    - run: make check-docs
+

.mdox.validate.yaml

@@ -0,0 +1,6 @@
+version: 1
+
+validators:
+  # Ignore localhost links.
+  - regex: 'localhost'
+    type: "ignore"

Makefile

@@ -2,6 +2,8 @@ GIT_COMMIT ?= $(shell git rev-list -1 HEAD)
 GIT_BRANCH ?= $(shell git rev-parse --abbrev-ref HEAD)
 LOCAL_DOCKER_BASE := local/dev_promscale_extension
 GHCR_DOCKER_BASE := ghcr.io/timescale/dev_promscale_extension
+MDOX_BIN=mdox
+MDOX_VALIDATE_CONFIG=
 
 .PHONY: build
 build: generate
@@ -50,5 +52,17 @@ generate-helm: deploy/helm-chart/templates/prometheus-rule.yaml
 deploy/helm-chart/templates/prometheus-rule.yaml:
 	./scripts/generate-helm-alerts.sh
 
+MDOX_VALIDATE_CONFIG?=.mdox.validate.yaml
+MD_FILES_TO_FORMAT=$(shell find -type f -name '*.md')
+.PHONY: docs
+docs:
+	@echo ">> formatting and local/remote links"
+	$(MDOX_BIN) fmt --soft-wraps -l --links.validate.config-file=$(MDOX_VALIDATE_CONFIG) $(MD_FILES_TO_FORMAT)
+
+.PHONY: check-docs
+check-docs:
+	@echo ">> checking formatting and local/remote links"
+	$(MDOX_BIN) fmt --soft-wraps --check -l --links.validate.config-file=$(MDOX_VALIDATE_CONFIG) $(MD_FILES_TO_FORMAT)
+
 .PHONY: all
 all: build test go-fmt go-lint