Support building for other architectures (#36)

.github/workflows/test.yml

@@ -13,24 +13,31 @@ jobs:
       matrix:
         include:
           - package: at
+            arch: amd64
             repo: https://salsa.debian.org/debian/at.git
             ref: debian/3.1.23-1
           - package: lolcat
+            arch: arm64
             repo: https://salsa.debian.org/ruby-team/lolcat.git
             ref: debian/100.0.1-2
           - package: micro
+            arch: amd64
             repo: https://salsa.debian.org/go-team/packages/micro.git
             ref: debian/2.0.6-2_bpo10+1
           - package: dropbear
+            arch: arm64
             repo: https://salsa.debian.org/debian/dropbear.git
             ref: debian/2016.74-5+deb9u1
           - package: deber
+            arch: amd64
             repo: https://github.com/dawidd6/deber.git
             ref: v1.0.0
           - package: netcat-openbsd
+            arch: arm64
             repo: https://git.launchpad.net/ubuntu/+source/netcat-openbsd
             ref: import/1.206-1ubuntu1
           - package: iproute2
+            arch: amd64
             repo: https://git.launchpad.net/ubuntu/+source/iproute2
             ref: import/4.18.0-1ubuntu2_ubuntu18.04.1
     steps:
@@ -41,6 +48,7 @@ jobs:
       - name: Test run
         uses: ./
         with:
+          cpu_architecture: ${{matrix.arch}}
           source_directory: ${{matrix.package}}
           artifacts_directory: artifacts
       - name: Check files

action.yml

@@ -4,6 +4,10 @@ branding:
   color: red
   icon: package
 inputs:
+  cpu_architecture:
+    description: Target CPU architecture
+    required: false
+    default: amd64
   source_directory:
     description: Directory where Debian sources are, relative to workspace
     required: false

main.js

@@ -28,6 +28,7 @@ async function getImageName(distribution) {
 
 async function main() {
     try {
+        const cpuArchitecture = core.getInput("cpu_architecture") || "amd64"
         const sourceRelativeDirectory = core.getInput("source_directory") || "./"
         const artifactsRelativeDirectory = core.getInput("artifacts_directory") || "./"
         const osDistribution = core.getInput("os_distribution") || ""
@@ -67,9 +68,18 @@ async function main() {
         console.log(details)
         core.endGroup()
 
+        if (cpuArchitecture != "amd64") {
+            core.startGroup("Install QEMU")
+            // Need newer QEMU to avoid errors
+            await exec.exec("wget", ["http://mirrors.kernel.org/ubuntu/pool/universe/q/qemu/qemu-user-static_5.2+dfsg-9ubuntu2_amd64.deb", "-O", "/tmp/qemu.deb"])
+            await exec.exec("sudo", ["dpkg", "-i", "/tmp/qemu.deb"])
+            core.endGroup()
+        }
+
         core.startGroup("Create container")
         await exec.exec("docker", [
             "create",
+            "--platform", `linux/${cpuArchitecture}`,
             "--name", container,
             "--volume", workspaceDirectory + ":" + workspaceDirectory,
             "--workdir", sourceDirectory,