move to after changing base urls because it would fail with packages not found

Author: henderkes

static-builder-gnu.Dockerfile

@@ -43,11 +43,6 @@ RUN sed -i 's/mirror.centos.org/vault.centos.org/g' /etc/yum.repos.d/*.repo && \
     yum update -y && \
     yum install -y centos-release-scl
 
-RUN if [ "${BUILD_PACKAGES}" != "" ]; then \
-        yum install -y ruby rpm-build && \
-        gem install fpm; \
-    fi
-
 # different arch for different scl repo
 RUN if [ "$(uname -m)" = "aarch64" ]; then \
         sed -i 's|mirror.centos.org/centos|vault.centos.org/altarch|g' /etc/yum.repos.d/CentOS-SCLo-scl-rh.repo ; \
@@ -70,6 +65,12 @@ RUN curl -o cmake.tgz -fsSL https://github.com/Kitware/CMake/releases/download/v
     tar -xzf cmake.tgz -C /cmake --strip-components 1 && \
     rm cmake.tgz
 
+# install tools to build packages, if requested
+RUN if [ "${BUILD_PACKAGES}" != "" ]; then \
+        yum install -y ruby rpm-build && \
+        gem install fpm; \
+    fi
+
 # install build essentials
 RUN yum install -y \
         perl \