squash: forgot to add yamllint config

.yamllint

@@ -0,0 +1,35 @@
+---
+
+# The following settings are recommended by ansible-lint project. They
+# may conflict with our other YAML files, but as of now, we test only
+# a very small subset of all YAML files in the repository. Once we start
+# extending the coverage, it may become a problem, and we will need to
+# resolve it, but the settings below seem reasonable enough that any
+# YAML file could comply.
+
+extends: default
+
+rules:
+  comments:
+    min-spaces-from-content: 1
+
+  comments-indentation: false
+
+  braces:
+    max-spaces-inside: 1
+
+  line-length:
+    max: 100
+
+  octal-values:
+    forbid-implicit-octal: true
+    forbid-explicit-octal: true
+
+  truthy:
+    level: error
+
+    allowed-values:
+      - "true"
+      - "false"
+
+    check-keys: true