Add buildx image for centos 8

Author: fabianfett

nightly-main/centos/8/buildx/Dockerfile

@@ -0,0 +1,79 @@
+FROM centos:8 AS base
+LABEL maintainer="Swift Infrastructure <[email protected]>"
+LABEL description="Docker Container for the Swift programming language"
+
+RUN yum install -y https://dl.fedoraproject.org/pub/epel/epel-release-latest-8.noarch.rpm
+
+RUN yum install --enablerepo=powertools -y \
+  binutils \
+  gcc \
+  git \
+  glibc-static \
+  libbsd-devel \
+  libedit \
+  libedit-devel \
+  libicu-devel \
+  libstdc++-static \
+  pkg-config \
+  python2 \
+  sqlite \
+  zlib-devel
+
+RUN ln -s /usr/bin/python2 /usr/bin/python
+
+# Everything up to here should cache nicely between Swift versions, assuming dev dependencies change little
+
+# gpg --keyid-format LONG -k FAF6989E1BC16FEA
+# pub   rsa4096/FAF6989E1BC16FEA 2019-11-07 [SC] [expires: 2021-11-06]
+#       8A7495662C3CD4AE18D95637FAF6989E1BC16FEA
+# uid                 [ unknown] Swift Automatic Signing Key #3 <[email protected]>
+ARG SWIFT_SIGNING_KEY=8A7495662C3CD4AE18D95637FAF6989E1BC16FEA
+ARG SWIFT_PLATFORM=centos
+ARG OS_MAJOR_VER=8
+ARG SWIFT_WEBROOT=https://swift.org/builds/development
+
+# This is a small trick to enable if/else for arm64 and amd64.
+# Because of https://bugs.swift.org/browse/SR-14872 we need adjust tar options. 
+FROM base AS base-amd64
+ARG OS_ARCH_SUFFIX=
+ARG ADDITIONAL_TAR_OPTIONS="--strip-components=1"
+
+FROM base AS base-arm64
+ARG OS_ARCH_SUFFIX=-aarch64
+ARG ADDITIONAL_TAR_OPTIONS=
+
+FROM base-$TARGETARCH AS final
+
+ARG OS_VER=$SWIFT_PLATFORM$OS_MAJOR_VER$OS_ARCH_SUFFIX
+ARG PLATFORM_WEBROOT="$SWIFT_WEBROOT/$SWIFT_PLATFORM$OS_MAJOR_VER$OS_ARCH_SUFFIX"
+
+RUN echo "${PLATFORM_WEBROOT}/latest-build.yml"
+
+RUN set -e; \
+    # - Latest Toolchain info
+    export $(curl -s ${PLATFORM_WEBROOT}/latest-build.yml | grep 'download:' | sed 's/:[^:\/\/]/=/g')  \
+    && export $(curl -s ${PLATFORM_WEBROOT}/latest-build.yml | grep 'download_signature:' | sed 's/:[^:\/\/]/=/g')  \
+    && export DOWNLOAD_DIR=$(echo $download | sed "s/-${OS_VER}.tar.gz//g") \
+    && echo $DOWNLOAD_DIR > .swift_tag \
+    # - Download the GPG keys, Swift toolchain, and toolchain signature, and verify.
+    && export GNUPGHOME="$(mktemp -d)" \
+    && curl -fsSL ${PLATFORM_WEBROOT}/${DOWNLOAD_DIR}/${download} -o latest_toolchain.tar.gz \
+    ${PLATFORM_WEBROOT}/${DOWNLOAD_DIR}/${download_signature} -o latest_toolchain.tar.gz.sig \
+    && curl -fSsL https://swift.org/keys/all-keys.asc | gpg --import -  \
+    && gpg --batch --verify latest_toolchain.tar.gz.sig latest_toolchain.tar.gz \
+    # - Unpack the toolchain, set libs permissions, and clean up.
+    && tar -xzf latest_toolchain.tar.gz --directory / ${ADDITIONAL_TAR_OPTIONS} \
+    && chmod -R o+r /usr/lib/swift \
+    && rm -rf "$GNUPGHOME" latest_toolchain.tar.gz.sig latest_toolchain.tar.gz
+
+# Print Installed Swift Version
+RUN swift --version
+
+RUN echo '[ ! -z "$TERM" -a -r /etc/motd ] && cat /etc/motd' \
+    >> /etc/bashrc; \
+    echo -e " ################################################################\n" \
+    "#\t\t\t\t\t\t\t\t#\n" \
+    "# Swift Nightly Docker Image\t\t\t\t\t#\n" \
+    "# Tag: $(cat .swift_tag)\t\t\t#\n" \
+    "#\t\t\t\t\t\t\t\t#\n"  \
+    "################################################################\n" > /etc/motd