[CI/CD] add GOPROXY for prod #5481

Job	Run time
Unit Tests	2m 44s
Lint	7m 50s
Build Unsigned Snapshot	3m 5s
Performance Tests	7m 36s
Unit tests with race condition detection	3m 12s
Integration Tests (alpine, 3.22)	5m 18s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	5m 51s
Integration Tests (ubuntu, 24.04)	6m 25s
Integration Tests - Official OSS Images (alpine, stable, alpine)	5m 52s
Integration Tests (redhatenterprise, 9)	6m 15s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	5m 38s
Integration Tests - Official OSS Images (bookworm, stable, debian)	5m 46s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	5m 53s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	5m 49s
Load Tests	5m 1s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	5m 53s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	6m 7s
	1h 34m 15s

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