Fixing CI jobs for Big Endian (#6414)

## What's the problem this PR addresses?

Observed below error while pulling s390x/node image in CI jobs for Big
Endian :
```
Unable to find image 's390x/node:latest' locally
latest: Pulling from s390x/node
docker: no matching manifest for linux/amd64 in the manifest list entries.
See 'docker run --help'.
```

## How did you fix it?

Adds `--platform` flag to pull s390x node image in CI builds.
Recently node images were updated. This PR fixes this
[issue](nodejs/docker-node#2124)

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Author: Prashant-Jagtap

.github/workflows/integration-workflow.yml

@@ -289,12 +289,12 @@ jobs:
 
     - name: 'Run the integration tests'
       run: |
-        docker run --rm --volume "$PWD:/berry" --env GITHUB_ACTIONS --env YARN_IGNORE_PATH=1 --workdir /berry s390x/node /bin/bash -c 'node ./packages/yarnpkg-cli/bundles/yarn.js test:integration --maxWorkers=100% --shard=${{matrix.shard}}'
+        docker run --rm --volume "$PWD:/berry" --env GITHUB_ACTIONS --env YARN_IGNORE_PATH=1 --workdir /berry --platform linux/s390x node /bin/bash -c 'node ./packages/yarnpkg-cli/bundles/yarn.js test:integration --maxWorkers=100% --shard=${{matrix.shard}}'
       shell: bash
 
     - name: 'Run the unit tests'
       run: |
-        docker run --rm --volume "$PWD:/berry" --env GITHUB_ACTIONS --env YARN_IGNORE_PATH=1 --workdir /berry s390x/node /bin/bash -c 'node ./packages/yarnpkg-cli/bundles/yarn.js test:unit --maxWorkers=100% --shard=${{matrix.shard}}'
+        docker run --rm --volume "$PWD:/berry" --env GITHUB_ACTIONS --env YARN_IGNORE_PATH=1 --workdir /berry --platform linux/s390x node /bin/bash -c 'node ./packages/yarnpkg-cli/bundles/yarn.js test:unit --maxWorkers=100% --shard=${{matrix.shard}}'
       shell: bash
       if: |
         success() || failure()