Add support for packages (workflow dispatch) and add libgpiod.

.github/workflows/build.yml

@@ -5,6 +5,12 @@ on:
   release:
     types: [published]
   workflow_dispatch:
+    inputs:
+      packages:
+        description: 'list of packages to build'
+        required: false
+        type: string
+        default: ''
 
 jobs:
   build-qemu:
@@ -15,7 +21,16 @@ jobs:
       matrix:
         arch: [armv7, aarch64, riscv64, s390x, ppc64le]
 
+    env:
+      # For workflow dispatches the value will be overridden by the input.
+      PACKAGES:
+
     steps:
+      - name: Set packages variable
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        run: |
+          echo "PACKAGES=${{ github.event.inputs.packages }}" >> $GITHUB_ENV
+
       - uses: uraimo/run-on-arch-action@v2
         name: Run commands
         id: runcmd
@@ -42,6 +57,7 @@ jobs:
               curl \
               git \
               libssl-dev \
+              libgpiod-dev \
               pkg-config \
               python3 \
               python3-pip \
@@ -50,7 +66,8 @@ jobs:
               sudo \
               unzip \
               wget \
-              zip
+              zip \
+              ${{env.PACKAGES}}
 
           shell: /bin/bash
 
@@ -79,7 +96,16 @@ jobs:
     name: Build sysroot for Raspbian
     runs-on: ubuntu-latest
 
+    env:
+      # For workflow dispatches the value will be overridden by the input.
+      PACKAGES:
+
     steps:
+      - name: Set packages variable
+        if: ${{ github.event_name == 'workflow_dispatch' }}
+        run: |
+          echo "PACKAGES=${{ github.event.inputs.packages }}" >> $GITHUB_ENV
+
       - uses: actions/checkout@v3
 
       - name: Build
@@ -89,7 +115,8 @@ jobs:
           third_party/rpi/sysroot.py \
               --distro raspbian \
               --sysroot $(realpath .) \
-              libc6-dev libstdc++-6-dev
+              libc6-dev libstdc++-6-dev \
+              $PACKAGES
 
       - name: Compress
         run: |