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This PR is related to the goals outlined in #17 - to get the image at https://hub.docker.com/r/messagebird/pushprom/ up-to-date and automatically building/pushing.
Here pushprom is built in an Alpine container, which is what the existing image uses. I had to set
CGO_ENABLED=1
to get the build to work, which differs from the Makefile build. I ended-up adding a multi-stage build to slim-down the final image size.Since this uses an in-container in-Alpine toolchain, it is likely that the resulting binary is linked differently - I don't know which toolchain was used to build the binary uploaded into the existing image.
If this approach works, it should allow the existing image (last pushed 2 years ago) to be flipped-over to an automated build.