install python cryptography from alpine repo instead of pip

Author: aptalca

Dockerfile

@@ -60,6 +60,7 @@ RUN \
 	php7-xml \
 	php7-xmlreader \
 	php7-zip \
+	py2-cryptography \
 	py2-future \
 	py2-pip && \
  echo "**** install certbot plugins ****" && \
@@ -68,9 +69,9 @@ RUN \
  else \
         CERTBOT="certbot==${CERTBOT_VERSION}"; \
  fi && \
- pip install -U --no-cache-dir \
+ pip install -U \
 	pip && \
- pip install -U --no-cache-dir \
+ pip install -U \
 	${CERTBOT} \
 	certbot-dns-cloudflare \
 	certbot-dns-cloudxns \

Dockerfile.aarch64

@@ -63,6 +63,7 @@ RUN \
 	php7-xml \
 	php7-xmlreader \
 	php7-zip \
+	py2-cryptography \
 	py2-future \
 	py2-pip && \
  echo "**** install certbot plugins ****" && \
@@ -71,9 +72,9 @@ RUN \
  else \
         CERTBOT="certbot==${CERTBOT_VERSION}"; \
  fi && \
- pip install -U --no-cache-dir \
+ pip install -U \
 	pip && \
- pip install -U --no-cache-dir \
+ pip install -U \
 	${CERTBOT} \
 	certbot-dns-cloudflare \
 	certbot-dns-cloudxns \

Dockerfile.armhf

@@ -63,6 +63,7 @@ RUN \
 	php7-xml \
 	php7-xmlreader \
 	php7-zip \
+	py2-cryptography \
 	py2-future \
 	py2-pip && \
  echo "**** install certbot plugins ****" && \
@@ -71,9 +72,9 @@ RUN \
  else \
         CERTBOT="certbot==${CERTBOT_VERSION}"; \
  fi && \
- pip install -U --no-cache-dir \
+ pip install -U \
 	pip && \
- pip install -U --no-cache-dir \
+ pip install -U \
 	${CERTBOT} \
 	certbot-dns-cloudflare \
 	certbot-dns-cloudxns \