chore: add publish to test pypi workflow

Signed-off-by: Bobo Bäck Engström <bobo@id8-engineering.io>

Author: Dexter9532

.github/workflows/publish-to-test-pypi.yaml

@@ -0,0 +1,67 @@
+name: publish-to-test-pypi
+
+on:
+  push:
+    branches: ["publish_testpypi"]
+
+jobs:
+  build:
+    name: Build distribution
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python
+        uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c
+        with:
+          python-version: "3.x"
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@85856786d1ce8acfbcc2f13a5f3fbd6b938f9f41 # v7.1.2
+
+      - name: Install hatch
+        run: uv tool install hatch
+
+      - name: Inject unique build tag into VERSION file
+        run: |
+          BASE_VERSION=$(cat VERSION)
+          BUILD=".dev${{ github.run_id }}${{ github.run_number }}${{ github.run_attempt }}"
+          echo "${BASE_VERSION}${BUILD}" > VERSION
+
+      - name: Build distributions with uv
+        run: uv build --wheel
+
+      - name: Upload distributions as artifact
+        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 #  v5.0.0
+        with:
+          name: python-package-distributions-${{ github.run_id }}
+          path: dist/
+
+  publish-to-test-pypi:
+    name: Publish Python distribution to TestPyPI
+    needs: [build]
+    runs-on: ubuntu-latest
+
+    environment:
+      name: testpypi
+      url: https://test.pypi.org/p/python-dcm230
+
+    permissions:
+      id-token: write
+
+    steps:
+      - name: Download all build artifacts
+        uses: actions/download-artifact@634f93cb2916e3fdff6788551b99b062d0335ce0 #  v5.0.0
+        with:
+          name: python-package-distributions-${{ github.run_id }}
+          path: dist/
+
+      - name: Publish to TestPyPI
+        uses: pypa/gh-action-pypi-publish@release/v1
+        with:
+          repository-url: https://test.pypi.org/legacy/
+          verbose: true

VERSION

@@ -0,0 +1 @@
+0.0.1

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "python-dcm230"
-version = "0.0.1"
+dynamic = ["version"]
 description = "Driver for Eastron DCM230 DC energy Meters using Modbus RTU"
 readme = "README.md"
 
@@ -42,6 +42,11 @@ build-backend = "hatchling.build"
 [tool.hatch.build.targets.wheel]
 packages = ["src/dcm230"]
 
+[tool.hatch.version]
+source = "regex"
+path = "VERSION"
+pattern = "(?P<version>.*)"
+
 [dependency-groups]
 dev = [
     "pre-commit>=4.3.0",