Problem investigation that JST is converted to +0000 +0000 when golang timezone conversion is performed on Alpine docker image

Introduction

I've pulled a bit of a maniac bug, so can this contribute to OSS? I think, I will summarize the survey record

Event

--In the process of converting the time of golang running on the docker image of alpine, the time that should be converted in the JST time zone like 2020-11-08 00:04:05 +0900 JST is 2020 -11-07 15:04:05 +0000 + 0000 --golang: build with 1.12.4 --alpine: latest (as of the end of October 2020) → 3.20? --tzdata: latest (as of the end of October 2020) → tzdata2020d-r0?

Other facts include:

--It was working until mid-October --It works fine if you replace zoneinfo --Alpine tzdata was updated just on October 25th (alpine tzdata, [commit](https: //) From git.alpinelinux.org/aports/commit/?id=fbc0b7dac48b9df9d3b9a04e514b6445b75f2e52))

Verification

Since tzdata2020d could not be used at the time of verification, it was verified with tzdata2020c-r0, but the conclusion is as follows.

-** I got the result that JST conversion is not possible when using alpine && tzdata2020c-r0 and tzdata2020d-r0 with the binary built with golang1.12 **.

Use the research repository (alpine_tzdata_investigation) and use Docker to check the combination of several versions. , Notes describes how to check.)

go version	docker image	tzdata	result	note
go 1.12	alpine 3.12.1	tzdata 2020c-r0	failure	version isdockerhubandalpinepackageConfirm with
go 1.12	alpine 3.10.3	tzdata 2020c-r0	failure
go 1.12	alpine edge	tzdata 2020d-r0	failure
go 1.12	alpine 3.8	tzdata 2020a-r0	success	Because only alpine 8 was using 2020a
golang 1.12	ubuntu 20.04	tzdata 2020d-0ubuntu0.20.04	success	version isdockerhubandUbuntupackagesConfirm with
golang 1.15.4(alpine)	alpha 3.12.1	tzdata 2020c-r0	success	golang version is[golang dockerhub]Confirm with
golang 1.13	alpine 3.12.1	tzdata 2020c-r0	success

result, --go 1.12 but ubuntu and alpine && tzdata2020a will pass --alpine && tzdata2020c-r0, tzdata2020d-r0 will pass if golang 1.13 or later

I understand this.

Coping

Change the version of go or alpine
If you really don't want to change both, replace tzdata (sample)