Add GOPROXY on release jobs #4798

Job	Run time
Lint	4m 17s
Unit tests with race condition detection	2m 24s
Build Unsigned Snapshot	1m 56s
Performance Tests	4m 38s
Unit Tests	2m 20s
Load Tests	4m 18s
Integration Tests (ubuntu, 22.04)	9m 26s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	5m 53s
Integration Tests (redhatenterprise, 9)	8m 41s
Integration Tests - Official OSS Images (bookworm, stable, debian)	6m 5s
Integration Tests (alpine, 3.19)	6m 37s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	5m 49s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	6m 28s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	6m 1s
Integration Tests - Official OSS Images (alpine, stable, alpine)	6m 0s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	6m 13s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	6m 2s
Publish NGINX Agent v3 packages	0s
	1h 33m 8s

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