chore: Add Taskfile tasks to lint YAML files.

.gitignore

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+# Build-related directories and files
+.task
+build

lint-requirements.txt

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+yamllint>=1.35.1

taskfile.yaml

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+version: "3"
+
+includes:
+  lint: "./taskfiles/lint.yaml"
+  utils: "tools/yscope-dev-utils/taskfiles/utils.yml"
+
+vars:
+  G_BUILD_DIR: "{{.ROOT_DIR}}/build"
+
+tasks:
+  clean:
+    cmds:
+      - "rm -rf '{{.G_BUILD_DIR}}'"
+
+  init:
+    internal: true
+    silent: true
+    run: "once"
+    cmds:
+      - "mkdir -p '{{.G_BUILD_DIR}}'"

taskfiles/lint-yaml.yaml

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+version: "3"
+
+tasks:
+  yaml:
+    aliases:
+      - "yaml-check"
+      - "yaml-fix"
+    deps:
+      - "venv"
+    dir: "{{.ROOT_DIR}}"
+    cmds:
+      - |-
+        . "{{.G_LINT_VENV_DIR}}/bin/activate"
+        yamllint \
+          --config-file "tools/yscope-dev-utils/lint-configs/.yamllint.yml" \
+          --strict \
+          .github \
+          taskfile.yaml \
+          taskfiles/

taskfiles/lint.yaml

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+version: "3"
+
+includes:
+  yaml:
+    flatten: true
+    taskfile: "./lint-yaml.yaml"
+
+vars:
+  G_LINT_VENV_DIR: "{{.G_BUILD_DIR}}/lint-venv"
+  G_LINT_VENV_CHECKSUM_FILE: "{{.G_BUILD_DIR}}/lint#venv.md5"
+
+tasks:
+  check:
+    cmds:
+      - task: "yaml-check"
+
+  fix:
+    cmds:
+      - task: "yaml-fix"
+
+  venv:
+    internal: true
+    vars:
+      CHECKSUM_FILE: "{{.G_LINT_VENV_CHECKSUM_FILE}}"
+      OUTPUT_DIR: "{{.G_LINT_VENV_DIR}}"
+    sources:
+      - "{{.ROOT_DIR}}/taskfile.yaml"
+      - "{{.TASKFILE}}"
+      - "lint-requirements.txt"
+    generates:
+      - "{{.CHECKSUM_FILE}}"
+    deps:
+      - ":init"
+      - task: ":utils:validate-checksum"
+        vars:
+          CHECKSUM_FILE: "{{.CHECKSUM_FILE}}"
+          DATA_DIR: "{{.OUTPUT_DIR}}"
+    cmds:
+      - task: ":utils:create-venv"
+        vars:
+          LABEL: "lint"
+          OUTPUT_DIR: "{{.OUTPUT_DIR}}"
+          REQUIREMENTS_FILE: "lint-requirements.txt"
+      # This command must be last
+      - task: ":utils:compute-checksum"
+        vars:
+          DATA_DIR: "{{.OUTPUT_DIR}}"
+          OUTPUT_FILE: "{{.CHECKSUM_FILE}}"