Don't build caches into Docker images (#4537)

* Don't cache pip install data in the Docker image

* Don't cache Alpine Linux package data in the Docker image

Dockerfile

@@ -13,13 +13,13 @@ WORKDIR azure-cli
 COPY . /azure-cli
 # pip wheel - required for CLI packaging
 # jmespath-terminal - we include jpterm as a useful tool
-RUN pip install --upgrade pip wheel jmespath-terminal
+RUN pip install --no-cache-dir --upgrade pip wheel jmespath-terminal
 # bash gcc make openssl-dev libffi-dev musl-dev - dependencies required for CLI
 # jq - we include jq as a useful tool
 # openssh - included for ssh-keygen
 # ca-certificates
 # wget - required for installing jp
-RUN apk update && apk add bash gcc make openssl-dev libffi-dev musl-dev jq openssh \
+RUN apk add --no-cache bash gcc make openssl-dev libffi-dev musl-dev jq openssh \
     ca-certificates wget openssl git && update-ca-certificates
 # We also, install jp
 RUN wget https://github.com/jmespath/jp/releases/download/0.1.2/jp-linux-amd64 -qO /usr/local/bin/jp && chmod +x /usr/local/bin/jp
@@ -35,8 +35,8 @@ RUN /bin/bash -c 'TMP_PKG_DIR=$(mktemp -d); \
     for f in $TMP_PKG_DIR/*; \
     do MODULE_NAMES="$MODULE_NAMES $f"; \
     done; \
-    pip install $MODULE_NAMES; \
-    pip install --force-reinstall --upgrade azure-nspkg azure-mgmt-nspkg;'
+    pip install --no-cache-dir $MODULE_NAMES; \
+    pip install --no-cache-dir --force-reinstall --upgrade azure-nspkg azure-mgmt-nspkg;'
 
 # Tab completion
 RUN echo -e "\

packaged_releases/docker/Dockerfile

@@ -25,14 +25,13 @@ LABEL org.label-schema.schema-version="1.0" \
 # INSTALL DEPENDENCIES
 # pip wheel - required for CLI packaging
 # jmespath-terminal - we include jpterm as a useful tool
-RUN pip install --upgrade pip wheel jmespath-terminal
+RUN pip install --no-cache-dir --upgrade pip wheel jmespath-terminal
 # bash gcc openssl-dev libffi-dev musl-dev - dependencies required for CLI
 # jq - we include jq as a useful tool
 # openssh - included for ssh-keygen
-# ca-certificates 
+# ca-certificates
 # wget - required for installing jp
-RUN apk update \
-        && apk add bash gcc make openssl-dev libffi-dev musl-dev jq openssh ca-certificates wget openssl git \
+RUN apk add --no-cache bash gcc make openssl-dev libffi-dev musl-dev jq openssh ca-certificates wget openssl git \
         && update-ca-certificates
 # We also, install jp
 RUN wget https://github.com/jmespath/jp/releases/download/0.1.2/jp-linux-amd64 -qO /usr/local/bin/jp \

scripts/github_bot/api/Dockerfile

@@ -5,10 +5,10 @@
 
 FROM python:3.5.2-alpine
 
-RUN apk update && apk upgrade && \
+RUN apk upgrade --no-cache && \
     apk add --no-cache bash git openssh
 
-RUN pip install --upgrade pip gunicorn Flask wheel twine requests uritemplate.py
+RUN pip install --no-cache-dir --upgrade pip gunicorn Flask wheel twine requests uritemplate.py
 
 ADD app.py /
 

scripts/releaser/Dockerfile

@@ -5,11 +5,11 @@
 
 FROM python:3.5.2-alpine
 
-RUN apk update && apk upgrade && \
+RUN apk upgrade --no-cache && \
     apk add --no-cache bash git openssh gcc make \
-    openssl-dev libffi-dev musl-dev ca-certificates openssl && update-ca-certificates
+      openssl-dev libffi-dev musl-dev ca-certificates openssl && update-ca-certificates
 
-RUN pip install --upgrade pip wheel twine requests virtualenv uritemplate.py azure-cli sh
+RUN pip install --no-cache-dir --upgrade pip wheel twine requests virtualenv uritemplate.py azure-cli sh
 
 ADD . /