[PATCH] CI: Clean up alpine containers

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

 * `apk --no-cache` is the preferred way of setting up containers, and it does
   shrink the image by a few MB.
 * Neither container needs curl-dev.
 * Flex and bison are needed for Xen, so move to the Xen block.

Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
CC: Doug Goldstein <cardoe@xxxxxxxxxx>
CC: Wei Liu <wl@xxxxxxx>
CC: Anthony PERARD <anthony.perard@xxxxxxxxxx>
CC: Roger Pau Monné <roger.pau@xxxxxxxxxx>
CC: Stefano Stabellini <sstabellini@xxxxxxxxxx>

I've already rebuilt the containers and confirmed that the build is still fine.
---
 automation/build/alpine/3.12-arm64v8.dockerfile | 69 ++++++++++-------------
 automation/build/alpine/3.12.dockerfile         | 75 +++++++++++--------------
 2 files changed, 65 insertions(+), 79 deletions(-)

diff --git a/automation/build/alpine/3.12-arm64v8.dockerfile 
b/automation/build/alpine/3.12-arm64v8.dockerfile
index a1ac9605959e..006cdb3668b3 100644
--- a/automation/build/alpine/3.12-arm64v8.dockerfile
+++ b/automation/build/alpine/3.12-arm64v8.dockerfile
@@ -8,46 +8,39 @@ RUN mkdir /build
 WORKDIR /build
 
 # build depends
-RUN \
-  # apk
-  apk update && \
+RUN apk --no-cache add \
   \
   # xen build deps
-  apk add argp-standalone && \
-  apk add autoconf && \
-  apk add automake && \
-  apk add bash && \
-  apk add curl && \
-  apk add curl-dev && \
-  apk add dev86 && \
-  apk add dtc-dev && \
-  apk add gcc  && \
+  argp-standalone \
+  autoconf \
+  automake \
+  bash \
+  bison \
+  curl \
+  dev86 \
+  dtc-dev \
+  flex \
+  gcc \
   # gettext for Xen < 4.13
-  apk add gettext && \
-  apk add git && \
-  apk add iasl && \
-  apk add libaio-dev && \
-  apk add libfdt && \
-  apk add linux-headers && \
-  apk add make && \
-  apk add musl-dev  && \
-  apk add ncurses-dev && \
-  apk add patch  && \
-  apk add python3-dev && \
-  apk add texinfo && \
-  apk add util-linux-dev && \
-  apk add xz-dev && \
-  apk add yajl-dev && \
-  apk add zlib-dev && \
+  gettext \
+  git \
+  iasl \
+  libaio-dev \
+  libfdt \
+  linux-headers \
+  make \
+  musl-dev  \
+  ncurses-dev \
+  patch  \
+  python3-dev \
+  texinfo \
+  util-linux-dev \
+  xz-dev \
+  yajl-dev \
+  zlib-dev \
   \
   # qemu build deps
-  apk add bison && \
-  apk add flex && \
-  apk add glib-dev && \
-  apk add libattr && \
-  apk add libcap-ng-dev && \
-  apk add pixman-dev && \
-  \
-  # cleanup
-  rm -rf /tmp/* && \
-  rm -f /var/cache/apk/*
+  glib-dev \
+  libattr \
+  libcap-ng-dev \
+  pixman-dev \
diff --git a/automation/build/alpine/3.12.dockerfile 
b/automation/build/alpine/3.12.dockerfile
index 4cce7ab926dc..22cad2524972 100644
--- a/automation/build/alpine/3.12.dockerfile
+++ b/automation/build/alpine/3.12.dockerfile
@@ -8,49 +8,42 @@ RUN mkdir /build
 WORKDIR /build
 
 # build depends
-RUN \
-  # apk
-  apk update && \
+RUN apk --no-cache add \
   \
   # xen build deps
-  apk add argp-standalone && \
-  apk add autoconf && \
-  apk add automake && \
-  apk add bash && \
-  apk add curl && \
-  apk add curl-dev && \
-  apk add dev86 && \
-  apk add gcc  && \
-  apk add g++ && \
-  apk add clang  && \
+  argp-standalone \
+  autoconf \
+  automake \
+  bash \
+  bison \
+  clang \
+  curl \
+  dev86 \
+  flex \
+  g++ \
+  gcc \
   # gettext for Xen < 4.13
-  apk add gettext && \
-  apk add git && \
-  apk add grep && \
-  apk add iasl && \
-  apk add libaio-dev && \
-  apk add linux-headers && \
-  apk add make && \
-  apk add musl-dev  && \
-  apk add libc6-compat && \
-  apk add ncurses-dev && \
-  apk add patch  && \
-  apk add python3-dev && \
-  apk add texinfo && \
-  apk add util-linux-dev && \
-  apk add xz-dev && \
-  apk add yajl-dev && \
-  apk add zlib-dev && \
+  gettext \
+  git \
+  grep \
+  iasl \
+  libaio-dev \
+  libc6-compat \
+  linux-headers \
+  make \
+  musl-dev  \
+  ncurses-dev \
+  patch  \
+  python3-dev \
+  texinfo \
+  util-linux-dev \
+  xz-dev \
+  yajl-dev \
+  zlib-dev \
   \
   # qemu build deps
-  apk add bison && \
-  apk add flex && \
-  apk add glib-dev && \
-  apk add libattr && \
-  apk add libcap-ng-dev && \
-  apk add ninja && \
-  apk add pixman-dev && \
-  \
-  # cleanup
-  rm -rf /tmp/* && \
-  rm -f /var/cache/apk/*
+  glib-dev \
+  libattr \
+  libcap-ng-dev \
+  ninja \
+  pixman-dev \
-- 
2.11.0