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yosifkittianon
yosifkit
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tianon
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Use COPY --link to share Go layer across OS variants / updates
This makes the Go layer reproducible such that re-pulling it can be avoided when switching between OS variants or OS updates. ```console $ docker buildx build --builder foo --pull --build-arg BUILDKIT_SYNTAX=docker/dockerfile:1 1.21/alpine3.18 --quiet --output type=oci | tar -tv | grep a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 -r--r--r-- 0/0 67061931 1969-12-31 16:00 blobs/sha256/a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 $ docker buildx build --builder foo --pull --build-arg BUILDKIT_SYNTAX=docker/dockerfile:1 1.21/alpine3.19 --quiet --output type=oci | tar -tv | grep a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 -r--r--r-- 0/0 67061931 1969-12-31 16:00 blobs/sha256/a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 $ docker buildx build --builder foo --pull --build-arg BUILDKIT_SYNTAX=docker/dockerfile:1 1.21/bookworm --quiet --output type=oci | tar -tv | grep a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 -r--r--r-- 0/0 67061931 1969-12-31 16:00 blobs/sha256/a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 $ docker buildx build --builder foo --pull --build-arg BUILDKIT_SYNTAX=docker/dockerfile:1 1.21/bullseye --quiet --output type=oci | tar -tv | grep a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 -r--r--r-- 0/0 67061931 1969-12-31 16:00 blobs/sha256/a3881458cc9d5f6798ed03914b3fb322f3620ca53deca3b2c4460676912d16f5 ```
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‎1.20/alpine3.18/Dockerfile

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‎1.20/alpine3.19/Dockerfile

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‎1.20/bookworm/Dockerfile

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‎1.20/bullseye/Dockerfile

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‎1.21/alpine3.18/Dockerfile

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