Merge #2440

2440: The ARM wheels don't work r=mergify[bot] a=nextgens

## What type of PR?

bug-fix

## What does this PR do?

Remove piwheels to ensure we always rebuild on ARM

### Related issue(s)
- closes #2439
- #1200


Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>

core/admin/Dockerfile

@@ -37,7 +37,7 @@ WORKDIR /app
 COPY requirements-prod.txt requirements.txt
 RUN set -eu \
  && apk add --no-cache libressl curl postgresql-libs mariadb-connector-c \
- && pip install --no-cache-dir --extra-index-url=https://www.piwheels.org/simple -r requirements.txt --only-binary=:all: --no-binary=Flask-bootstrap,PyYAML,SQLAlchemy \
+ && pip install --no-cache-dir -r requirements.txt --only-binary=:all: --no-binary=Flask-bootstrap,PyYAML,SQLAlchemy \
  || ( apk add --no-cache --virtual build-dep libressl-dev libffi-dev python3-dev build-base postgresql-dev mariadb-connector-c-dev cargo \
  && pip install --upgrade pip \
  && pip install -r requirements.txt \

core/postfix/Dockerfile

@@ -22,7 +22,7 @@ RUN apk add --no-cache --virtual .build-deps gcc musl-dev python3-dev \
 
 # Image specific layers under this line
 # Building pycares from source requires py3-wheel and libffi-dev packages
-RUN pip install --no-cache-dir --extra-index-url=https://www.piwheels.org/simple --only-binary=:all: postfix-mta-sts-resolver==1.0.1 || (apk add --no-cache --virtual .build-deps gcc musl-dev python3-dev py3-wheel libffi-dev \
+RUN pip install --no-cache-dir --only-binary=:all: postfix-mta-sts-resolver==1.0.1 || (apk add --no-cache --virtual .build-deps gcc musl-dev python3-dev py3-wheel libffi-dev \
   && pip3 install postfix-mta-sts-resolver==1.0.1 \
   && apk del .build-deps )