diff --git a/README.md b/README.md
index a3c66a2..4776894 100644
--- a/README.md
+++ b/README.md
@@ -46,6 +46,57 @@ options:
   --verbose            enable verbose output
 ```
 
+## Using via Docker Image
+
+### Building the Docker Image
+
+You can build the Docker image for this project by running the following command:
+
+```bash
+python setup.py build_docker
+```
+
+OR directly from root project directory:
+
+```bash
+docker build --file docker/Dockerfile -t grep-ast-image .
+```
+
+### Calling grep-ast from Docker image
+
+To grep from current working directory we mount it to docker to give access so paths will work also inside docker, example:
+
+```
+docker run -it -v "$(pwd)":/app:ro grep-ast-image str grep_ast/*.py
+```
+
+### Using Docker image for pytest tests!
+
+To ensure reproducible testing and ease of debugging, you can run pytest tests inside the Docker image. This is particularly useful when collaborating in an open-source manner.
+
+You can use this docker image e.g. to run pytest:
+
+```bash
+python setup.py docker_test
+```
+
+OR directly:
+
+```
+docker run -it --entrypoint bash grep-ast-image -c 'cd /grep-ast; pwd; pytest'
+```
+
+This command will build the Docker image and execute pytest tests inside it.
+
+### If you want to debug Docker image itself
+
+If you want to execute commands inside docker image, overwrite entrypoint with bash and give it commands you want, examples:
+
+```bash
+$ docker run -it -v "$(pwd)":/app:ro --entrypoint bash grep-ast-image -c 'cd /app; pwd; ls'
+$ docker run -it --entrypoint bash grep-ast-image -c 'cd /grep-ast; pwd; ls'
+```
+
 ## Examples
 
 Here we search for **"encoding"** in the source to this tool:
diff --git a/docker/Dockerfile b/docker/Dockerfile
new file mode 100644
index 0000000..c5bb2d3
--- /dev/null
+++ b/docker/Dockerfile
@@ -0,0 +1,13 @@
+FROM python:3.10-slim
+COPY . /grep-ast
+
+# Unfortunately to build the multi-arch docker image we need `build-essential` for amd64.
+# Apparently py-tree-sitter-languages doesn't have a pre-built binary wheel?
+
+RUN apt-get update && \
+    apt-get install --no-install-recommends -y build-essential git libportaudio2 && \
+    rm -rf /var/lib/apt/lists/* && \
+    pip install pytest && \
+    pip install --no-cache-dir /grep-ast
+WORKDIR /app
+ENTRYPOINT ["grep-ast"]
diff --git a/grep_ast/parsers.py b/grep_ast/parsers.py
index 0a5f336..3f5f9b0 100644
--- a/grep_ast/parsers.py
+++ b/grep_ast/parsers.py
@@ -46,10 +46,11 @@
     ".scala": "scala",
     ".sql": "sql",
     ".sqlite": "sqlite",
+    ".sw": "sway",  # https://github.com/FuelLabs/tree-sitter-sway
     ".toml": "toml",
     ".tsq": "tsq",
-    ".tsx": "typescript",
     ".ts": "typescript",
+    ".tsx": "typescript",
     ".yaml": "yaml",
 }
 
diff --git a/setup.py b/setup.py
index 961a257..a03f85d 100644
--- a/setup.py
+++ b/setup.py
@@ -1,6 +1,7 @@
 import re
+import subprocess
 
-from setuptools import find_packages, setup
+from setuptools import Command, find_packages, setup
 
 with open("requirements.txt") as f:
     requirements = f.read().splitlines()
@@ -9,7 +10,61 @@
     long_description = f.read()
     long_description = re.sub(r"\n!\[.*\]\(.*\)", "", long_description)
 
+
+class BuildDockerImageCommand(Command):
+    description = "Build Docker image for the project"
+    user_options = []
+
+    def initialize_options(self):
+        pass
+
+    def finalize_options(self):
+        pass
+
+    def run(self):
+        command = ["docker", "build", "--file", "docker/Dockerfile", "-t", "grep-ast-image", "."]
+        subprocess.check_call(command)
+
+
+class DockerTestCommand(Command):
+    description = "Build Docker image and run pytest inside it"
+    user_options = []
+
+    def initialize_options(self):
+        pass
+
+    def finalize_options(self):
+        pass
+
+    def run(self):
+        build_command = [
+            "docker",
+            "build",
+            "--file",
+            "docker/Dockerfile",
+            "-t",
+            "grep-ast-image",
+            ".",
+        ]
+        test_command = [
+            "docker",
+            "run",
+            "-it",
+            "--entrypoint",
+            "bash",
+            "grep-ast-image",
+            "-c",
+            "cd /grep-ast; pytest",
+        ]
+        subprocess.check_call(build_command)
+        subprocess.check_call(test_command)
+
+
 setup(
+    cmdclass={
+        "build_docker": BuildDockerImageCommand,
+        "docker_test": DockerTestCommand,
+    },
     name="grep-ast",
     version="0.2.4",
     description="A tool to grep through the AST of a source file",