Allow specifying a build arch

Default x86_64

action.yaml

@@ -5,6 +5,10 @@ inputs:
   specfile:
     description: The filename of the spec file to build. If not set and there is only 1 specfile, it will be selected automatically.
     required: false
+  build_arch:
+    description: Build architecture, default x86_64
+    required: false
+    default: x86_64
 runs:
   using: "composite"
   steps:
@@ -21,7 +25,8 @@ runs:
         microdnf builddep -y $SPECFILE
         echo Checking for missing builddeps
         counter=1
-        until rpmbuild --undefine=_disable_source_fetch --define "_sourcedir $PWD" --define "_topdir $PWD" -bd $SPECFILE || [ $counter -gt 5 ]; do
+        RPMBUILDARGS=(--target=${{ inputs.build_arch }} --define="_disable_source_fetch 0" --define "_sourcedir $PWD" --define "_topdir $PWD")
+        until rpmbuild "${RPMBUILDARGS[@]}" -bd $SPECFILE || [ $counter -gt 5 ]; do
           echo Installing missing builddeps round $counter
           microdnf builddep -y SRPMS/$(rpmspec -q --srpm --qf '%{nevr}' $SPECFILE).buildreqs.nosrc.rpm
           ((counter++))
@@ -29,7 +34,7 @@ runs:
         echo RPM autospeccing
         rpmautospec process-distgit $SPECFILE $SPECFILE
         echo Building rpm and srpm
-        rpmbuild --undefine=_disable_source_fetch --define "_sourcedir $PWD" --define "_topdir $PWD" -ba $SPECFILE
+        rpmbuild "${RPMBUILDARGS[@]}" -ba $SPECFILE
         echo "Built $SPECFILE"
 branding:
   icon: "package"