Add tzdata at version 2020f

zoneinfo/Dockerfile

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+FROM alpine:3 as zoneinfo
+RUN apk --no-cache add ca-certificates
+# ADD https://github.com/golang/go/raw/master/lib/time/zoneinfo.zip .
+# 2020f
+ADD https://github.com/golang/go/tree/20d0991b86f533a734cad96b2002678d9750e6d8/lib/time/zoneinfo.zip .
+
+FROM scratch
+# https://golang.org/pkg/time/#LoadLocation
+# https://golang.org/src/time/zoneinfo_unix.go
+# Many systems use /usr/share/zoneinfo, Solaris 2 has
+# /usr/share/lib/zoneinfo, IRIX 6 has /usr/lib/locale/TZ.
+ENV ZONEINFO /usr/share/zoneinfo
+
+# Copy the time zone database.
+COPY --from=zoneinfo /zoneinfo.zip /usr/share/zoneinfo

zoneinfo/cloudbuild.yaml

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+# In this directory, run the following command to build this builder.
+# $ gcloud builds submit
+
+steps:
+# Build all supported versions.
+- name: 'gcr.io/cloud-builders/docker'
+  args:
+  - 'build'
+  - '--tag=us.gcr.io/$PROJECT_ID/zoneinfo:2020f'
+  - '.'
+
+timeout: 1m0s
+
+images:
+- 'us.gcr.io/$PROJECT_ID/zoneinfo:2020f'