Update Dockerfile - alpine:3.12 -> alpine:3.15

The support for the base image alpine:3.12 will expire in 4 months (https://endoflife.date/alpine), so it would make sense to upgrade to the current version alpine:3.15. 
I was able to create the acme.sh image with the new alpine:3.15 version without errors and also create and deploy a certificate, but further testing would be useful.
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Christian Burmeister 2021-12-21 22:20:42 +01:00 committed by GitHub
parent 86d8cbc4d2
commit 3105235a7a
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@ -1,4 +1,4 @@
FROM alpine:3.12
FROM alpine:3.15
RUN apk --no-cache add -f \
openssl \