Add in a workflow for building locally

.github/workflows/local.yml

@@ -0,0 +1,40 @@
+# This is a workflow intended to be run locally using `act` and `docker` to
+# build locally
+
+name: local
+
+# Controls when the workflow will run
+on:
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  local-build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    defaults:
+      run:
+        working-directory: android_app
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup JDK
+        uses: actions/setup-java@v3
+        with:
+          distribution: "zulu" # See 'Supported distributions' for available options
+          java-version: "17"
+      - name: Setup Android SDK
+        uses: android-actions/[email protected]
+      - name: Build APK
+        run: ./gradlew assembleDebug
+      - name: Upload Release Build to Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+           name: release-artifacts
+           path: android_app/app/build/outputs/apk/

README.md

@@ -11,6 +11,17 @@ Open-source weight and body metrics tracker, with support for Bluetooth scales
 
 Install [openScale-dev-build.apk](https://github.com/oliexdev/openScale/releases/tag/dev-build) to get the latest development build generated by GitHub Actions. Also be aware that this version may contain bugs and you don't get any automatic updates.
 
+# Building locally :construction_worker:
+It is possible to build an apk locally for development purposes using [act](https://github.com/nektos/act) and [docker](https://docker.com/).
+
+
+## Quick start to build an apk locally
+```sh
+act -j local-build --artifact-server-path ~/Downloads/artifacts
+```
+
+Once run there will be a zipped artefact in `~/Downloads/artifacts` which you can unzip to see the generated apk file.
+
 # Summary :clipboard:
 
 Monitor and track your weight, BMI, body fat, body water, muscle and other body metrics in an open source app that: