Github action to create a raspberry pi image (#302)

Co-authored-by: Tony Kuker <akuker@gmail.com>

.github/workflows/rpi_image_creation.yml

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+name: Generate a RaSCSI OS image, based upon the official Rapsberry Pi OS
+
+# Controls when the workflow will run
+on:
+  # Triggers the workflow on push or pull request events but only for the rpi_image_creation branch
+  push:
+    branches: [ rpi_image_creation, develop, master ]
+  pull_request:
+    branches: [ rpi_image_creation, develop, master ]
+
+  # 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"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    # TODO: I don't think this step is needed....
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout RaSCSI
+        uses: actions/checkout@v2
+        with:
+          path: RASCSI
+      
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - name: Checkout RaSCSI
+        uses: actions/checkout@v2
+        with:
+          repository: akuker/pi-gen
+          path: pi-gen
+      
+      - name: Install Raspberry Pi build toolchain
+        run: sudo apt-get install coreutils quilt parted qemu-user-static debootstrap zerofree zip dosfstools libarchive-tools libcap2-bin grep rsync xz-utils file git curl bc qemu-utils kpartx
+
+      - name: Configure the build
+        run: |
+          echo -----------------------------------------------------
+          echo "IMG_NAME=RaSCSI-$GITHUB_RUN_ID" > config
+          echo "TARGET_HOSTNAME=rascsi" >> config
+          echo "ENABLE_SSH=1" >> config
+          echo "LOCALE_DEFAULT=en_US.UTF-8" >> config
+          echo "KEYBOARD_KEYMAP=us" >> config
+          echo "KEYBOARD_LAYOUT=\"English (US)\"" >> config
+          echo -----------------------------------------------------
+          cat config
+        working-directory: pi-gen
+
+      - name: Run the Raspberry Pi build generation tool
+        run: sudo ./build.sh
+        working-directory: pi-gen
+
+      - name: List the files in the deploy directory
+        run: |
+          echo -----------------------------------------------------
+          ls -alh pi-gen/deploy/
+          echo -----------------------------------------------------
+          
+      - name: Archive the build artifacts
+        uses: actions/upload-artifact@v2.2.4
+        with:
+          # Artifact name
+          name: raspberry-pi-image
+          # A file, directory or wildcard pattern that describes what to upload
+          path: pi-gen/deploy/*