diff --git a/.github/workflows/container-image-buildah.yml b/.github/workflows/container-image-buildah.yml
index fd4d0af..a7da5c4 100644
--- a/.github/workflows/container-image-buildah.yml
+++ b/.github/workflows/container-image-buildah.yml
@@ -1,15 +1,17 @@
-name: Container Image
+name: Container Image Reusable Workflow
 
 on:
-  workflow_dispatch: {}
-  workflow_call: {}
-  schedule:
-    # every Wednesday morning
-    - cron: 7 7 * * 3
-  push:
-    branches: [ main ]
-  pull_request:
-    types: [opened, reopened, synchronize]
+  workflow_call:
+    inputs:
+      platforms:
+        description: comma-separated list of platforms to build for, e.g. linux/amd64,linux/s390x,linux/ppc64le
+        default: linux/amd64,linux/ppc64le
+        type: string
+      custom_tag:
+        description: optional custom tag on remote repo you want image to be tagged with
+        required: false
+        default: ''
+        type: string
 
 concurrency:
   group: ci-container-build-${{ github.ref }}-1
@@ -49,7 +51,9 @@ jobs:
           tags: |
             type=schedule
             type=raw,value=latest,enable=${{ github.ref_name == 'main' }}
-            ${{ github.ref_name == 'main' && 'type=raw,value=nightly' || 'type=ref,event=branch' }}
+            type=raw,value=nightly,enable=${{ github.ref_name == 'main' }}
+            type=ref,event=branch,enable=${{ github.ref_name != 'main' && inputs.custom_tag == '' }}
+            ${{ inputs.custom_tag }}
             type=ref,event=tag
             type=ref,event=pr
 
@@ -61,7 +65,7 @@ jobs:
         uses: redhat-actions/buildah-build@v2
         with:
           tags: ${{ steps.meta.outputs.tags }}
-          platforms: linux/amd64,linux/s390x,linux/ppc64le
+          platforms: ${{ inputs.platforms }}
           labels: ${{ steps.meta.outputs.labels }}
           layers: false
           oci: true
diff --git a/.github/workflows/container-image.yml b/.github/workflows/container-image.yml
new file mode 100644
index 0000000..134aee5
--- /dev/null
+++ b/.github/workflows/container-image.yml
@@ -0,0 +1,25 @@
+name: Container Image
+
+on:
+  schedule:
+    # every Wednesday morning
+    - cron: 7 7 * * 3
+  push:
+    branches: [ main ]
+  pull_request:
+    types: [opened, reopened, synchronize]
+  workflow_dispatch:
+    inputs:
+      platforms:
+        description: comma-separated list of platforms to build for, downstream supported are linux/amd64,linux/s390x,linux/ppc64le; note: clang is broken on s390x (RHEL-15874) and gcc takes more than 6 hours so we don't build it by default
+        default: linux/amd64,linux/ppc64le
+      custom_tag:
+        description: a custom tag on remote repo you want image to be tagged with
+        default: scratch
+
+jobs:
+  call-build:
+    uses: ./.github/workflows/container-image-buildah.yml
+    with:
+      platforms: ${{ inputs.platforms == '' && 'linux/amd64,linux/ppc64le' || inputs.platforms }}
+      custom_tag: ${{ inputs.custom_tag }}
diff --git a/Containerfile b/Containerfile
index d7f03d7..7abebf9 100644
--- a/Containerfile
+++ b/Containerfile
@@ -8,17 +8,16 @@ ENV SEARCHD_REF=6.2.12 \
 WORKDIR $BUILD_PATH
 
 SHELL ["/bin/bash", "-x", "-o", "pipefail", "-c"]
+# clang is broken on s390x (RHEL-15874), to use gcc remove CC and CXX variables,
+#   also replace llvm-toolset with make automake gcc gcc-c++ kernel-devel
 # hadolint ignore=DL3003,DL3032,SC2046
 RUN yum install -y --setopt=skip_missing_names_on_install=False,tsflags=nodocs llvm-toolset mysql cmake boost-devel openssl-devel zlib-devel bison flex systemd-units rpm-build git && \
       git clone --depth=1 --branch=$SEARCHD_REF $SEARCHD_REPO . && \
       sed -i -e 's/Boost_USE_STATIC_LIBS ON/Boost_USE_STATIC_LIBS OFF/' src/CMakeLists.txt && \
       mkdir build && cd build && \
-      clang-16 --version && clang++-16 --version && \
       cmake $BUILD_FLAGS .. && \
       cmake --build . --target package --config RelWithDebInfo
 
-# /tmp/manticore_uselessly_long_path_to_prevent_rpm_build_issues/build/manticore-tools-debuginfo-6.2.12_230823.4553471-1.el9.x86_64.rpm and other RPMs
-
 FROM quay.io/centos/centos:stream9-minimal
 
 LABEL org.opencontainers.image.authors="https://issues.redhat.com/browse/THREESCALE" \