Refactor dependency management to use pip dependency groups

Updated `pyproject.toml` to utilize pip's `--group` feature for dependencies. Adjusted
the README and Dockerfile to reflect the new dependency management approach.

Author: amCap1712

README.md

@@ -9,7 +9,10 @@ Please report issues at https://tickets.musicbrainz.org/browse/BU.
 
 # Development
 To develop BrainzUtils itself, install it locally in editable mode with development
-dependencies by running: `pip install -e '.[dev]'`.
+dependencies by running: `pip install --group dev -e .`. 
+
+> [!NOTE]  
+> Support for dependency groups (`--group`) was added to pip in 25.1.0.
 
 ## Usage
 

pyproject.toml

@@ -21,13 +21,16 @@ dependencies = [
     "mbdata@git+https://github.com/metabrainz/mbdata.git@v30.0.0"
 ]
 
-[project.optional-dependencies]
+[dependency-groups]
 dev = [
     "psycopg2-binary==2.9.10",
+]
+test = [
     "freezegun==1.5.1",
     "pytest==8.3.5",
     "pytest-cov==6.1.1",
-    "pylint==3.3.6"
+    "pylint==3.3.6",
+    { include-group = "dev" }
 ]
 
 [tool.setuptools]

test/Dockerfile

@@ -7,16 +7,10 @@ RUN wget https://github.com/jwilder/dockerize/releases/download/$DOCKERIZE_VERSI
 RUN mkdir /code
 WORKDIR /code
 
-# Python dependencies
-RUN apt-get update \
-    && apt-get install -y --no-install-recommends \
-                       build-essential \
-                       git
+RUN pip install --upgrade pip==25.1.1
 
-COPY requirements.txt  /code/requirements.txt
-COPY requirements_dev.txt /code/requirements_dev.txt
-RUN pip install -r requirements.txt
-RUN pip install -r requirements_dev.txt
+COPY pyproject.toml /code/pyproject.toml
+RUN pip install --group test .
 
 COPY . /code/