CI script changes to fail on diff (#2364)

CONTRIBUTING.md

@@ -126,7 +126,7 @@ All matched files use Prettier code style!
 To _fix_ formatting run:
 
 ```console
-$ npm run check:formatting -- --write
+$ npm run prettier:write
 ```
 
 ### Submodule changes

netlify.toml

@@ -1,9 +1,9 @@
 [build]
 publish = "public"
-command = "npm run build:preview"
+command = "npm run s build:preview diff:fail"
 
 [context.production]
-command = "npm run build:production"
+command = "npm run s build:production diff:fail"
 
 [[redirects]]
 from = "https://docs.opentelemetry.io/*"

package.json

@@ -8,6 +8,7 @@
   "scripts": {
     "__check:links": "make --keep-going check-links",
     "_build": "hugo --cleanDestinationDir -e dev -DFE",
+    "_check:formatting": "npx prettier --check .",
     "_check:links": "HTMLTEST_ARGS='--log-level 1' npm run __check:links",
     "_check:links:internal": "npm run __check:links",
     "_get:no": "echo SKIPPING get operation",
@@ -15,7 +16,7 @@
     "_get:submodule": "set -x && git submodule update --init ${DEPTH:- --depth 1}",
     "_prebuild": "run-s get:submodule cp:spec",
     "_prepare:docsy": "cd themes/docsy && npm install",
-    "_serve:hugo": "hugo serve --disableFastRender -DFE --minify",
+    "_serve:hugo": "hugo serve -DFE --minify",
     "_serve": "netlify dev -c \"npm run _serve:hugo\"",
     "all": "npm-run-all",
     "build:preview": "set -x && npm run _build -- --minify --baseURL \"${DEPLOY_PRIME_URL:-/}\"",
@@ -23,11 +24,13 @@
     "build": "npm run _build",
     "cd:public": "cd public &&",
     "check": "npm run all -- check:*",
-    "check:formatting": "npx prettier --check .",
+    "check:formatting": "npm run _check:formatting || (echo '[help] Run: npm run prettier:write'; exit 1)",
     "check:links": "npm run _check:links",
     "check:links:internal": "npm run _check:links:internal",
     "clean": "make clean",
     "cp:spec": "./scripts/content-modules/cp-pages.sh",
+    "diff:check": "git diff --name-only --exit-code || (echo; echo 'WARNING: the files above have not been committed'; echo)",
+    "diff:fail": "git diff --name-only --exit-code || (echo; echo 'ERROR: the files above have changed. Locally rerun `npm run test` and commit changes'; echo; exit 1)",
     "get:submodule": "npm run _get:${GET:-submodule}",
     "make:public": "make public ls-public",
     "postbuild:preview": "npm run _check:links",
@@ -40,6 +43,7 @@
     "prepare": "run-s get:submodule _prepare:docsy",
     "preserve:hugo": "npm run _prebuild",
     "prettier:no-ignore": "npx prettier --ignore-path ''",
+    "prettier:write": "npm run _check:formatting -- --write",
     "preserve": "npm run _prebuild",
     "s": "run-s",
     "schemas:update": "npm run update:submodule content-modules/opentelemetry-specification",