chore: add repository quality gates with pre-commit

.editorconfig

@@ -0,0 +1,15 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab

.gitattributes

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+* text=auto eol=lf
+
+*.sh text eol=lf
+*.yaml text eol=lf
+*.yml text eol=lf
+*.md text eol=lf
+Dockerfile text eol=lf
+
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary

.markdownlint.json

@@ -0,0 +1,5 @@
+{
+  "default": true,
+  "MD013": false,
+  "MD034": false
+}

.pre-commit-config.yaml

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+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files
+      - id: check-merge-conflict
+
+  - repo: https://github.com/shellcheck-py/shellcheck-py
+    rev: v0.11.0.1
+    hooks:
+      - id: shellcheck
+
+  - repo: https://github.com/rhysd/actionlint
+    rev: v1.7.12
+    hooks:
+      - id: actionlint
+
+  - repo: https://github.com/adrienverge/yamllint.git
+    rev: v1.37.1
+    hooks:
+      - id: yamllint
+
+  - repo: https://github.com/igorshubovych/markdownlint-cli
+    rev: v0.45.0
+    hooks:
+      - id: markdownlint

.yamllint

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+---
+extends: default
+
+rules:
+  line-length:
+    max: 140
+    level: warning
+
+  truthy:
+    allowed-values:
+      - "true"
+      - "false"
+      - "on"
+      - "off"
+
+  document-start:
+    present: true