Fix goproxy for forks (#1183) #5551

Job	Run time
set-vars	5s
Lint	6m 10s
Performance Tests	7m 35s
Build Unsigned Snapshot	2m 36s
Unit Tests	2m 38s
Unit tests with race condition detection	2m 59s
Integration Tests - Official OSS Images (bookworm, stable, debian)	5m 33s
Integration Tests (alpine, 3.22)	5m 0s
Integration Tests (redhatenterprise, 9)	5m 5s
Integration Tests (ubuntu, 24.04)	4m 50s
Integration Tests - Official OSS Images (bookworm, mainline, debian)	5m 45s
Load Tests	5m 10s
Integration Tests - Official Plus Images (alpine, 3.19, r31, alpine, /nginx-plus/agent)	5m 29s
Integration Tests - Official Plus Images (debian, bookworm, r31, debian, /nginx-plus/agent)	5m 33s
Integration Tests - Official OSS Images (alpine, stable, alpine)	5m 23s
Integration Tests - Official Plus Images (debian, bookworm, r32, debian, /nginx-plus/agent)	5m 42s
Integration Tests - Official OSS Images (alpine, mainline, alpine)	5m 23s
Integration Tests - Official Plus Images (alpine, 3.20, r32, alpine, /nginx-plus/agent)	5m 30s
	1h 26m 26s

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