Multi-architecture support for s3-resource Dockerfile #184
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Related to concourse/concourse#9183
Updated the Dockerfile to support multi-architecture builds. Key changes:
Added TARGETOS and TARGETARCH arguments for cross-compilationSet builder to use BUILDPLATFORM for faster buildsConfigured Go builds with explicit GOOS/GOARCH for target platformsThis enables building the s3-resource container for multiple architectures (amd64, arm64, etc.) from a single build pipeline.