fix(image): Fix Operator ARM64 image build (#1538)

# Description

To address issue with Operator container image build on ARM64 nodes,
this PR fixes the issue by updating the Dockerfile to use the correct
base image for ARM64 nodes.
Also, the image build ADO pipeline has been updated to use the correct
base image for ARM64 nodes.

## Related Issue

No GitHub issue is linked to this PR
ADO work item:
https://msazure.visualstudio.com/One/_workitems/edit/32236163

## Checklist

- [X] I have read the [contributing
documentation](https://retina.sh/docs/Contributing/overview).
- [X] I signed and signed-off the commits (`git commit -S -s ...`). See
[this
documentation](https://docs.github.com/en/authentication/managing-commit-signature-verification/about-commit-signature-verification)
on signing commits.
- [X] I have correctly attributed the author(s) of the code.
- [X] I have tested the changes locally.
- [X] I have followed the project's style guidelines.
- [ ] I have updated the documentation, if necessary.
- [ ] I have added tests, if applicable.

## Screenshots (if applicable) or Testing Completed

Deployment on cluster that only has ARM64 nodes


![image](https://github.com/user-attachments/assets/871bc614-468a-426d-816a-bd724e11c867)

## Additional Notes

Add any additional notes or context about the pull request here.

---

Please refer to the [CONTRIBUTING.md](../CONTRIBUTING.md) file for more
information on how to contribute to this project.

Author: apontejaj

Diff for: .github/workflows/images.yaml

@@ -122,7 +122,7 @@ jobs:
     strategy:
       matrix:
         platform: ["linux"]
-        arch: ["amd64"]
+        arch: ["amd64", "arm64"]
 
     steps:
       - name: Checkout code

Diff for: deploy/hubble/manifests/controller/helm/retina/templates/operator/deployment.yaml

@@ -35,10 +35,6 @@ spec:
           requiredDuringSchedulingIgnoredDuringExecution:
             nodeSelectorTerms:
               - matchExpressions:
-                  - key: kubernetes.io/arch
-                    operator: In
-                    values:
-                      - amd64
                   - key: kubernetes.io/os
                     operator: In
                     values:

Diff for: deploy/standard/manifests/controller/helm/retina/templates/operator.yaml

@@ -37,13 +37,6 @@ spec:
           requiredDuringSchedulingIgnoredDuringExecution:
             nodeSelectorTerms:
               - matchExpressions:
-                  - key: kubernetes.io/arch
-                    operator: In
-                    values:
-                      - amd64
-                      #- arm64
-                      #- ppc64le
-                      #- s390x
                   - key: kubernetes.io/os
                     operator: In
                     values:

Diff for: operator/Dockerfile

@@ -19,7 +19,7 @@ ENV GOARCH=${GOARCH}
 
 RUN make manifests
 RUN --mount=type=cache,target="/root/.cache/go-build" \
-	GOOS=linux GOARCH=amd64 go build \
+	GOOS=$GOOS GOARCH=$GOARCH go build \
 	-ldflags "-X github.com/microsoft/retina/internal/buildinfo.Version="$VERSION" \
 	-X "github.com/microsoft/retina/internal/buildinfo.ApplicationInsightsID"="$APP_INSIGHTS_ID"" \
 	-a -o retina-operator operator/main.go