recently I started seeing the following (I even see this on past successful builds):
Step 3/12 : LABEL "maintainer"="Lars Gohr"
---> Running in 9d77cee4d6ce
Removing intermediate container 9d77cee4d6ce
---> 9082b5a5618c
Step 4/12 : RUN apk update && apk upgrade && apk add --no-cache python py-pip bash jq && pip install awscli && apk --purge -v del py-pip
---> Running in cd99825221f7
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
v3.12.0-9-gc3ce4065bd [http://dl-cdn.alpinelinux.org/alpine/v3.12/main]
v3.12.0-5-g644078feb4 [http://dl-cdn.alpinelinux.org/alpine/v3.12/community]
OK: 12726 distinct packages available
(1/1) Upgrading alpine-baselayout (3.2.0-r6 -> 3.2.0-r7)
Executing alpine-baselayout-3.2.0-r7.pre-upgrade
Executing alpine-baselayout-3.2.0-r7.post-upgrade
Executing busybox-1.31.1-r16.trigger
OK: 6 MiB in 14 packages
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.12/community/x86_64/APKINDEX.tar.gz
ERROR: unsatisfiable constraints:
python (missing):
required by: world[python]
The command '/bin/sh -c apk update && apk upgrade && apk add --no-cache python py-pip bash jq && pip install awscli && apk --purge -v del py-pip' returned a non-zero code: 1
##[warning]Docker build failed with exit code 1, back off 5.959 seconds before retry.