ci: use golang bci instead of manual download

ref: longhorn/longhorn#8721

Signed-off-by: davidko <dko@suse.com>

Dockerfile.dapper

@@ -5,7 +5,6 @@ ARG http_proxy
 ARG https_proxy
 
 ENV HOST_ARCH=${DAPPER_HOST_ARCH} ARCH=${DAPPER_HOST_ARCH}
-ENV PATH /go/bin:$PATH
 ENV DAPPER_DOCKER_SOCKET true
 ENV DAPPER_ENV TAG REPO DRONE_REPO DRONE_PULL_REQUEST DRONE_COMMIT_REF
 ENV DAPPER_OUTPUT bin coverage.out
@@ -16,25 +15,18 @@ ENTRYPOINT ["./scripts/entry"]
 CMD ["ci"]
 
 RUN zypper -n addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/SLE_15/system:snappy.repo && \
-    zypper --gpg-auto-import-keys ref && \
-    zypper -n ref && \
-    zypper update -y
+    zypper --gpg-auto-import-keys ref
 
 # Install packages
 RUN zypper -n install cmake wget curl git less file \
     libkmod-devel libnl3-devel linux-glibc-devel pkg-config psmisc python3-tox fuse python3-devel qemu-tools \
     bash-completion librdmacm1 librdmacm-utils libibverbs xsltproc docbook-xsl-stylesheets \
     perl-Config-General libaio-devel glibc-devel-static glibc-devel iptables libltdl7 libdevmapper1_03 iproute2 jq docker gcc
 
-# FIXME: Needed for ${!var} substitution
-RUN rm -f /bin/sh && ln -s /bin/bash /bin/sh
+## Install golangci-lint
+RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b /go/bin v1.55.2
 
-# Install tools
-
-## golangci-lint
-RUN curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.55.2
-
-## Docker Buildx: The docker version in dapper is too old to have buildx. Install it manually.
-RUN wget https://github.com/docker/buildx/releases/download/v0.13.1/buildx-v0.13.1.linux-${ARCH} && \
+## Install Docker Buildx: The docker version in dapper is too old to have buildx. Install it manually.
+RUN curl -sSfLO https://github.com/docker/buildx/releases/download/v0.13.1/buildx-v0.13.1.linux-${ARCH} && \
     chmod +x buildx-v0.13.1.linux-${ARCH} && \
     mv buildx-v0.13.1.linux-${ARCH} /usr/local/bin/buildx

package/Dockerfile

@@ -12,7 +12,9 @@ ENV ARCH ${TARGETPLATFORM#linux/}
 
 RUN zypper -n addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/SLE_15/system:snappy.repo && \
     zypper -n addrepo --refresh https://download.opensuse.org/repositories/network:/utilities/SLE_15_SP5/network:utilities.repo && \
-    zypper --gpg-auto-import-keys ref
+    zypper --gpg-auto-import-keys ref && \
+    zypper -n ref && \
+    zypper update -y
 
 RUN zypper -n install kmod curl wget nfs-client nfs4-acl-tools fuse \
     librdmacm1 librdmacm-utils libibverbs perl-Config-General libaio-devel sg3_utils \