diff --git a/.editorconfig b/.editorconfig
index 80ff443..d509d00 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -21,3 +21,8 @@ trim_trailing_whitespace = true
 [*.gleam]
 indent_style = space
 indent_size = 2
+
+# YAML cannot handle tabs
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
diff --git a/.github/workflows/check-copyright.yml b/.github/workflows/check-copyright.yml
new file mode 100644
index 0000000..87cf711
--- /dev/null
+++ b/.github/workflows/check-copyright.yml
@@ -0,0 +1,21 @@
+# SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Check copyright attributions
+
+on:
+  push:
+    # Runs on every push
+    branches:
+      - "*"
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run REUSE lint tool
+        uses: fsfe/reuse-action@v5
diff --git a/.github/workflows/check-format.yml b/.github/workflows/check-format.yml
new file mode 100644
index 0000000..430fe0e
--- /dev/null
+++ b/.github/workflows/check-format.yml
@@ -0,0 +1,29 @@
+# SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Check files are correctly formatted
+
+on:
+  push:
+    # Runs on every push
+    branches:
+      - "*"
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Gleam
+        uses: erlef/setup-beam@v1
+        with:
+          # Reading of `.tool-versions` in setup-beam is very limited: it only supports
+          # fully specified version strings, such as 1.2.3.
+          otp-version: "27"
+          gleam-version: "1.6"
+
+      - name: Check format with dprint
+        uses: dprint/check@v2.2
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
new file mode 100644
index 0000000..10619c5
--- /dev/null
+++ b/.github/workflows/test.yml
@@ -0,0 +1,41 @@
+# SPDX-FileCopyrightText: 2024 Shota FUJI <pockawoooh@gmail.com>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+name: Run tests
+
+on:
+  push:
+    # Runs on every push
+    branches:
+      - "*"
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Gleam
+        uses: erlef/setup-beam@v1
+        with:
+          # Reading of `.tool-versions` in setup-beam is very limited: it only supports
+          # fully specified version strings, such as 1.2.3.
+          otp-version: "27"
+          gleam-version: "1.6"
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: .tool-versions
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Run tests
+        run: npm test
+
+      - name: Check types
+        run: npx tsc
diff --git a/dprint.jsonc b/dprint.jsonc
index f96a75f..5770a67 100644
--- a/dprint.jsonc
+++ b/dprint.jsonc
@@ -13,6 +13,7 @@
 	"toml": {
 		"useTabs": true
 	},
+	"yaml": {},
 	"exec": {
 		"commands": [
 			{
@@ -26,6 +27,7 @@
 		"https://plugins.dprint.dev/markdown-0.17.8.wasm",
 		"https://plugins.dprint.dev/exec-0.5.0.json@8d9972eee71fa1590e04873540421f3eda7674d0f1aae3d7c788615e7b7413d0",
 		"https://plugins.dprint.dev/toml-0.6.3.wasm",
-		"https://plugins.dprint.dev/biome-0.7.1.wasm"
+		"https://plugins.dprint.dev/biome-0.7.1.wasm",
+		"https://plugins.dprint.dev/g-plane/pretty_yaml-v0.5.0.wasm"
 	]
 }