chore: introduce formatting patterns

.editorconfig

@@ -0,0 +1,26 @@
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 4
+indent_style = space
+insert_final_newline = true
+max_line_length = 180
+tab_width = 4
+trim_trailing_whitespace = true
+
+[{*.nix,*.yaml}]
+indent_size = 2
+tab_width = 2
+
+[*.html]
+max_line_length = off
+
+[/.sqlx/**]
+indent_size = unset
+tab_width = unset
+max_line_length = off
+
+[flake.lock]
+indent_size = unset
+tab_width = unset
+max_line_length = off

.github/workflows/formatting.yaml

@@ -0,0 +1,16 @@
+name: formatting
+
+on:
+  pull_request:
+  push:
+    branches: [master]
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - uses: editorconfig-checker/action-editorconfig-checker@main
+      - uses: actions/setup-python@v4
+      - uses: pre-commit/action@v3.0.0

.pre-commit-config.yaml

@@ -0,0 +1,23 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v4.6.0
+    hooks:
+      - id: detect-private-key
+      - id: check-added-large-files
+      - id: trailing-whitespace
+  - repo: local
+    hooks:
+      - id: editorconfig-checker
+        name: 'Check .editorconfig rules'
+        description: 'Runs system executable of `editorconfig-checker` to lint text files according to `.editorconfig` rules'
+        language: system
+        entry: editorconfig-checker
+        types: [ text ]
+        require_serial: true
+      - id: rustfmt
+        name: "rustfmt"
+        description: Format files with cargo fmt.
+        entry: cargo fmt
+        language: system
+        types: [rust]
+        args: ["--"]

rustfmt.toml

@@ -0,0 +1 @@
+max_width = 180