Try this

.github/workflows/graviton-build-test-push-workflow.yml

@@ -1,4 +1,4 @@
-name: Build and Test
+name: Graviton Build and Test
 on:
   push:
     branches:
@@ -96,7 +96,7 @@ jobs:
         export BUILDPLATFORM=linux/arm64
         export TARGETOS=linux
         export TARGETARCH=arm64
-        export TARGET_OS_IMAGE=public.ecr.aws/amazonlinux/amazonlinux:2023.0.20211014
+        export TARGETOSIMAGE=public.ecr.aws/amazonlinux/amazonlinux:2023.0.20211014
         docker buildx build --push --platform=linux/arm64,linux/amd64 --tag ${{ secrets.ECR_REPOSITORY }}/${{ env.SPLUNK_OPERATOR_IMAGE_NAME }}:$GITHUB_SHA -f Dockerfile.graviton .
     - name: Sign Splunk Operator image with a key
       run: |
@@ -271,7 +271,7 @@ jobs:
            export BUILDPLATFORM=linux/arm64
            export TARGETOS=linux
            export TARGETARCH=arm64
-           export TARGET_OS_IMAGE=public.ecr.aws/amazonlinux/amazonlinux:2023.0.20211014
+           export TARGETOSIMAGE=public.ecr.aws/amazonlinux/amazonlinux:2023.0.20211014
            export EKS_INSTANCE_TYPE=${{ steps.dotenv.outputs.EKS_INSTANCE_TYPE_GRAVITON }}
            make cluster-up
       - name: install metric server

.github/workflows/int-test-workflow.yml

@@ -4,7 +4,6 @@ on:
     branches:
       - develop
       - main
-      - CSPL_2920
 jobs:
   build-operator-image:
     runs-on: ubuntu-latest

Dockerfile.graviton

@@ -5,7 +5,7 @@ ARG TARGETPLATFORM
 ARG BUILDPLATFORM
 ARG TARGETOS
 ARG TARGETARCH
-ARG TARGET_OS_IMAGE
+ARG TARGETOSIMAGE
 
 WORKDIR /workspace
 # Copy the Go Modules manifests
@@ -28,7 +28,7 @@ RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -a -o manager m
 
 # Use distroless as minimal base image to package the manager binary
 # Refer to https://github.com/GoogleContainerTools/distroless for more details
-FROM --platform=${BUILDPLATFORM:-linux/amd64} ${TARGET_OS_IMAGE}
+FROM --platform=${BUILDPLATFORM:-linux/amd64} ${TARGETOSIMAGE}
 ENV OPERATOR=/manager \
     USER_UID=1001 \
     USER_NAME=nonroot