Fix typo in Dockerfile-centos7-assets -- s/custom-builds/custom-pac…

…kages/ (#35758)

`/opt/custom-builds` should be `/opt/custom-packages`

Oops, I renamed this and forgot to update it everywhere before landing.

build.assets/Dockerfile-centos7-assets

@@ -70,20 +70,20 @@ FROM centos-devtoolset as custom-packages
 RUN useradd --user-group --create-home --shell=/bin/bash mockbuild
 
 # Recompile and install libelf with -fPIC.
-RUN mkdir -p /opt/custom-builds && cd /opt && \
+RUN mkdir -p /opt/custom-packages && cd /opt && \
     yumdownloader --source elfutils-libelf-devel-static && \
     yum-builddep -y elfutils-libelf-devel-static && \
     rpmbuild --rebuild --define "optflags `rpm -E %{optflags}` -fPIC" elfutils-*.src.rpm && \
     if [ "${TARGETARCH}" = "arm64" ]; then export TARGETARCH="aarch64"; fi && \
-    cp /root/rpmbuild/RPMS/${TARGETARCH}/elfutils-libelf-devel-static-*.el7.${TARGETARCH}.rpm /opt/custom-builds/
+    cp /root/rpmbuild/RPMS/${TARGETARCH}/elfutils-libelf-devel-static-*.el7.${TARGETARCH}.rpm /opt/custom-packages/
 
 # Recompile and install zlib with -fPIC.
-RUN mkdir -p /opt/custom-builds && cd /opt && \
+RUN mkdir -p /opt/custom-packages && cd /opt && \
     yumdownloader --source zlib-static && \
     yum-builddep -y zlib-static && \
     rpmbuild --rebuild --define "optflags `rpm -E %{optflags}` -fPIC" zlib-*.src.rpm && \
     if [ "${TARGETARCH}" = "arm64" ]; then export TARGETARCH="aarch64"; fi && \
-    cp /root/rpmbuild/RPMS/${TARGETARCH}/zlib-static-*.el7.${TARGETARCH}.rpm /opt/custom-builds/
+    cp /root/rpmbuild/RPMS/${TARGETARCH}/zlib-static-*.el7.${TARGETARCH}.rpm /opt/custom-packages/
 
 # Create the final image with Clang and custom builds only. We're using this Docker image as a tar.gz
 # mainly because we want to keep our artifacts on GitHub, and GH doesn't support blobs, only Docker images.
@@ -93,4 +93,4 @@ FROM scratch AS buildbox-centos7-assets
 COPY --from=clang12 /opt/llvm /opt/llvm/
 
 # Copy custom packages into the final image.
-COPY --from=custom-packages /opt/custom-builds /opt/custom-builds/
+COPY --from=custom-packages /opt/custom-packages /opt/custom-packages/