fix: always write devcontainer.metadata label as JSON array (#1199) #4086

Job	Run time
OCI Implementation Registry Compatibility	1m 24s
CLI	44s
Install Script (macos-latest)	36s
Install Script (ubuntu-latest)	29s
Tests Matrix (src/test/cli.exec.buildKit.2.test.ts)	5m 52s
Tests Matrix (src/test/cli.exec.nonBuildKit.2.test.ts)	5m 4s
Tests Matrix (src/test/imageMetadata.test.ts)	6m 47s
Tests Matrix (src/test/cli.exec.buildKit.1.test.ts)	5m 18s
Tests Matrix (src/test/cli.build.test.ts)	11m 5s
Tests Matrix (src/test/cli.test.ts)	1m 11s
Tests Matrix (src/test/container-features/e2e.test.ts)	4m 10s
Tests Matrix (src/test/cli.up.test.ts)	5m 53s
Tests Matrix (--exclude src/test/container-features/containerFeaturesOrder.test.ts --exclude src/...	6m 54s
Tests Matrix (src/test/container-features/containerFeaturesOCIPush.test.ts)	59s
Tests Matrix (src/test/cli.podman.test.ts)	2m 35s
Tests Matrix (src/test/container-features/featuresCLICommands.test.ts)	3m 16s
Tests Matrix (src/test/container-features/containerFeaturesOrder.test.ts)	1m 31s
Tests Matrix (src/test/cli.exec.nonBuildKit.1.test.ts)	5m 24s
Tests	0s
	1h 9m 12s

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