Enforce yamllint in CI (#2381)

Start running and enforcing yamllint checks in CI.

.github/workflows/test.yml

@@ -12,4 +12,4 @@ jobs:
         with:
           python-version: '3.x'
       - run: git fetch --prune --unshallow --tags
-      - run: make check
+      - run: make check yamllint

Makefile

@@ -86,7 +86,7 @@ misspell:
 	fi
 	./build/misspell/bin/misspell -error README.md CONTRIBUTING.md schemas/* docs/* experimental/schemas/*
 
-# Warn re misspell removal     
+# Warn re misspell removal
 .PHONY: misspell_warn
 misspell_warn:
 	@echo "Warning: due to lack of cross-platform support, misspell is no longer included in this task and may be deprecated in future\n"
@@ -110,4 +110,4 @@ build/ve/bin/activate: scripts/requirements.txt scripts/requirements-dev.txt
 # Check YAML syntax (currently not enforced).
 .PHONY: yamllint
 yamllint: ve
-	build/ve/bin/yamllint schemas/*.yml
+	build/ve/bin/yamllint -d '{extends: default, rules: {line-length: disable}}' schemas/*.yml

schemas/email.yml

@@ -180,8 +180,8 @@
         A brief summary of the topic of the message.
       example: "Please see this important message."
       multi_fields:
-      - type: match_only_text
-        name: text
+        - type: match_only_text
+          name: text
 
     - name: to.address
       level: extended

schemas/pe.yml

@@ -208,4 +208,3 @@
       format: string
       type: long
       level: extended
-