provide smaller docker images cleaning go sdk after ther build

go/deploy

@@ -36,39 +36,30 @@ if [[ ${version_to_install} == "" ]]; then
   version_source="latest version"
 fi
 
-install_needed=1
-if [[ -x ${GO_INSTALL_DIR}/bin/go ]]; then
-  current_version=$(${GO_INSTALL_DIR}/bin/go version)
-  if [[ "${current_version}" == *" ${version_to_install} "* ]]; then
-    echo "Using already installed Go ${version_to_install} (${version_source})"
-    install_needed=0
-  fi
-fi
 
-if [[ ${install_needed} == 1 ]]; then
-  echo "Installing Go ${version_to_install} (${version_source})"
-
-  rm -rf ${GO_INSTALL_DIR}
-  version_dir=${GO_INSTALL_DIR}_${version_to_install}
-  rm -rf ${version_dir}
-  mkdir -p ${version_dir}
-  download_url=${GO_DOWNLOAD_URL}/${version_to_install}.linux-amd64.tar.gz
-  if ! (curl -m 120 -sS --retry 3 -L "$download_url" | tar xz -C ${version_dir}); then
-    echo "ERROR: Unable to download Go from ${download_url}."
-    exit 1
-  fi
+echo "Installing Go ${version_to_install} (${version_source})"
 
-  rm -rf ${version_dir}/api/ \
-    ${version_dir}/blog/ \
-    ${version_dir}/doc/ \
-    ${version_dir}/test/ \
-    ${version_dir}/lib/ \
-    ${version_dir}/misc/
+rm -rf ${GO_INSTALL_DIR}
+version_dir=${GO_INSTALL_DIR}_${version_to_install}
+rm -rf ${version_dir}
+mkdir -p ${version_dir}
+download_url=${GO_DOWNLOAD_URL}/${version_to_install}.linux-amd64.tar.gz
 
-  ln -s ${version_dir}/go ${GO_INSTALL_DIR}
-  hash -r
+if ! (curl -m 120 -sS --retry 3 -L "$download_url" | tar xz -C ${version_dir}); then
+  echo "ERROR: Unable to download Go from ${download_url}."
+  exit 1
 fi
 
+rm -rf ${version_dir}/api/ \
+  ${version_dir}/blog/ \
+  ${version_dir}/doc/ \
+  ${version_dir}/test/ \
+  ${version_dir}/lib/ \
+  ${version_dir}/misc/
+
+ln -s ${version_dir}/go ${GO_INSTALL_DIR}
+hash -r
+
 echo "Using Go version: $(go version)"
 
 if [ -z $(find ${APP_DIR}/current -name "*.go" -print -quit) ]; then
@@ -109,4 +100,9 @@ else
   go install $GO_BUILD_VENDOR ./...
 fi
 
+go clean -cache
+go clean -modcache
+
+rm -rf ${GO_INSTALL_DIR}
+
 popd >/dev/null 2>&1