setup automated firmware builds with github actions

.github/actions/setup-build-environment/action.yml

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+name: Setup Build Environment
+runs:
+  using: "composite"
+  steps:
+
+    - name: Init Cache
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cache/pip
+          ~/.platformio/.cache
+        key: ${{ runner.os }}-pio
+
+    - name: Install Python
+      uses: actions/setup-python@v5
+      with:
+        python-version: '3.11'
+
+    - name: Install PlatformIO
+      shell: bash
+      run: |
+        pip install --upgrade platformio
+
+    # a git tag of "room-server-v1.2.3" should set "v1.2.3" as GIT_TAG_VERSION
+    - name: Extract Version from Git Tag
+      shell: bash
+      run: |
+        GIT_TAG_NAME="${GITHUB_REF#refs/tags/}"
+        echo "GIT_TAG_VERSION=${GIT_TAG_NAME##*-}" >> $GITHUB_ENV

.github/workflows/build-companion-firmwares.yml

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+name: Build Companion Firmwares
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - 'companion-*'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Clone Repo
+        uses: actions/checkout@v4
+
+      - name: Setup Build Environment
+        uses: ./.github/actions/setup-build-environment
+
+      - name: Build Firmwares
+        env:
+          FIRMWARE_VERSION: ${{ env.GIT_TAG_VERSION }}
+        run: /usr/bin/env bash build.sh build-companion-firmwares
+
+      - name: Upload Workflow Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: companion-firmwares
+          path: out
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          name: Companion Firmware ${{ env.GIT_TAG_VERSION }}
+          body: ""
+          draft: true
+          files: out/*

.github/workflows/build-repeater-firmwares.yml

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+name: Build Repeater Firmwares
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - 'repeater-*'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Clone Repo
+        uses: actions/checkout@v4
+
+      - name: Setup Build Environment
+        uses: ./.github/actions/setup-build-environment
+
+      - name: Build Firmwares
+        env:
+          FIRMWARE_VERSION: ${{ env.GIT_TAG_VERSION }}
+        run: /usr/bin/env bash build.sh build-repeater-firmwares
+
+      - name: Upload Workflow Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: repeater-firmwares
+          path: out
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          name: Repeater Firmware ${{ env.GIT_TAG_VERSION }}
+          body: ""
+          draft: true
+          files: out/*

.github/workflows/build-room-server-firmwares.yml

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+name: Build Room Server Firmwares
+
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - 'room-server-*'
+
+jobs:
+
+  build:
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Clone Repo
+        uses: actions/checkout@v4
+
+      - name: Setup Build Environment
+        uses: ./.github/actions/setup-build-environment
+
+      - name: Build Firmwares
+        env:
+          FIRMWARE_VERSION: ${{ env.GIT_TAG_VERSION }}
+        run: /usr/bin/env bash build.sh build-room-server-firmwares
+
+      - name: Upload Workflow Artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: room-server-firmwares
+          path: out
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        if: startsWith(github.ref, 'refs/tags/')
+        with:
+          name: Room Server Firmware ${{ env.GIT_TAG_VERSION }}
+          body: ""
+          draft: true
+          files: out/*