build(oci): add config to allow building images for other archs (#1352)

README.md

@@ -48,6 +48,7 @@ Build Requirements:
 - JDK17+
 - Maven 3+
 - Podman 2.0+
+- `qemu-user-static` to build container images for other archs
 
 Run Requirements:
 - Kubernetes/OpenShift/Minishift, Podman/Docker, or other container platform

pom.xml

@@ -25,8 +25,10 @@
 
   <imageBuilder>/usr/bin/podman</imageBuilder>
 
+  <build.os>linux</build.os>
+  <build.arch>amd64</build.arch>
   <baseImage>localhost/cryostat-base</baseImage>
-  <baseImageTag>latest</baseImageTag>
+  <baseImageTag>latest-${build.os}-${build.arch}</baseImageTag>
   <baseImageTarball>base.tar.gz</baseImageTarball>
   <node.version>v16.18.1</node.version>
   <yarn.version>v1.22.19</yarn.version>
@@ -435,6 +437,8 @@
             <executable>${imageBuilder}</executable>
             <arguments>
               <argument>build</argument>
+              <argument>--platform</argument>
+              <argument>${build.os}/${build.arch}</argument>
               <argument>--file</argument>
               <argument>${project.build.outputDirectory}/Dockerfile</argument>
               <argument>--tag</argument>
@@ -753,10 +757,16 @@
         </dockerClient>
         <from>
           <image>tar://${project.build.directory}/${baseImageTarball}</image>
+          <platforms>
+            <platform>
+              <os>${build.os}</os>
+              <architecture>${build.arch}</architecture>
+            </platform>
+          </platforms>
         </from>
         <to>
           <image>${cryostat.imageStream}</image>
-          <tags>${cryostat.imageVersionLower}</tags>
+          <tags>${cryostat.imageVersionLower}-${build.os}-${build.arch}</tags>
         </to>
         <container>
           <format>OCI</format>