Introduce GitHub Action based CI

This change adds a configuration file for a GitHub Actions based CI
pipeline to the repository. This file (directly or indirectly) controls
the environment in which to build and test, and is also used for some
additional linting.
With the pipeline in place the change also adds a badge indicating the
status of the build on the project's front page.

.github/workflows/test.yml

@@ -0,0 +1,54 @@
+# Copyright (C) 2024 Daniel Mueller <deso@posteo.net>
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+name: Test
+
+on:
+  pull_request:
+  push:
+
+env:
+  CARGO_TERM_COLOR: always
+  RUST_BACKTRACE: 1
+  # Build without debug information enabled to decrease compilation time
+  # and binary sizes in CI. This option is assumed to only have marginal
+  # effects on the generated code, likely only in terms of section
+  # arrangement. See
+  # https://doc.rust-lang.org/cargo/reference/environment-variables.html
+  # https://doc.rust-lang.org/rustc/codegen-options/index.html#debuginfo
+  RUSTFLAGS: '-C debuginfo=0'
+
+jobs:
+  test:
+    name: Build and test [${{ matrix.rust }}, ${{ matrix.profile }}]
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust: [stable]
+        profile: [dev, release]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: dtolnay/rust-toolchain@master
+      with:
+        toolchain: ${{ matrix.rust }}
+    - name: Build & test ${{ matrix.profile }}
+      run: |
+        cargo build --profile=${{ matrix.profile }} --all-features --bins --tests
+        cargo test --profile=${{ matrix.profile }} --all-features
+  clippy:
+    name: Lint with clippy
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+      - run: cargo clippy --no-deps --all-targets --all-features --tests -- -A unknown_lints -A deprecated -D warnings
+  rustfmt:
+    name: Check code formatting
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@nightly
+        with:
+          components: rustfmt
+      - run: cargo +nightly fmt -- --check

.rustfmt.toml

@@ -0,0 +1,9 @@
+# Copyright (C) 2024 Daniel Mueller <deso@posteo.net>
+# SPDX-License-Identifier: CC0-1.0
+
+blank_lines_lower_bound = 0
+blank_lines_upper_bound = 2
+edition = "2021"
+match_block_trailing_comma = true
+tab_spaces = 2
+trailing_semicolon = false

CHANGELOG.md

@@ -1,3 +1,9 @@
+Unreleased
+----------
+- Removed unused `once_cell` and `regex` dependencies
+- Added GitHub Actions based CI workflow
+
+
 0.1.1
 -----
 - Factored out diff parsing functionality into `diff-parse` crate

README.md

@@ -1,3 +1,6 @@
+[![pipeline](https://github.com/d-e-s-o/git-blamediff/actions/workflows/test.yml/badge.svg?branch=main)](https://github.com/d-e-s-o/git-blamediff/actions/workflows/test.yml)
+[![crates.io](https://img.shields.io/crates/v/git-blamediff.svg)](https://crates.io/crates/git-blamediff)
+
 git-blamediff
 =============