ci: update centos builds

ci/docker/centos7

@@ -2,6 +2,7 @@ ARG BASE=centos:7
 FROM ${BASE} AS yum
 RUN yum install -y \
 	which \
+	bzip2 \
 	git \
 	libarchive \
 	gcc \
@@ -20,17 +21,32 @@ RUN cd /tmp && \
     cd libssh2-1.8.0 && \
     ./configure && \
     make && \
-    make install
+    make install && \
+    cd .. && \
+    rm -rf libssh-1.8.0
 
-FROM libssh2 AS cmake
+FROM libssh2 AS valgrind
+RUN cd /tmp && \
+    curl --insecure --location --silent --show-error https://sourceware.org/pub/valgrind/valgrind-3.15.0.tar.bz2 | \
+        tar -xj && \
+    cd valgrind-3.15.0 && \
+    ./configure && \
+    make MAKEFLAGS="-j -l$(grep -c ^processor /proc/cpuinfo)" && \
+    make install && \
+    cd .. && \
+    rm -rf valgrind-3.15.0
+
+FROM valgrind AS cmake
 RUN cd /tmp && \
     curl -L https://github.com/Kitware/CMake/releases/download/v3.21.1/cmake-3.21.1.tar.gz | tar -xz && \
     cd cmake-3.21.1 && \
     ./configure && \
     make && \
-    make install
+    make install && \
+    cd .. && \
+    rm -rf cmake-3.21.1
 
-FROM libssh2 AS adduser
+FROM cmake AS adduser
 RUN useradd --shell /bin/bash libgit2 --create-home
 
 FROM adduser AS configure

ci/docker/centos8

@@ -22,9 +22,22 @@ RUN cd /tmp && \
     cd libssh2-1.8.0 && \
     ./configure && \
     make && \
-    make install
+    make install && \
+    cd .. && \
+    rm -rf libssh2-1.8.0
 
-FROM libssh2 AS adduser
+FROM libssh2 AS valgrind
+RUN cd /tmp && \
+    curl --insecure --location --silent --show-error https://sourceware.org/pub/valgrind/valgrind-3.15.0.tar.bz2 | \
+        tar -xj && \
+    cd valgrind-3.15.0 && \
+    CC=clang-10 ./configure && \
+    make MAKEFLAGS="-j -l$(grep -c ^processor /proc/cpuinfo)" && \
+    make install && \
+    cd .. && \
+    rm -rf valgrind-3.15.0
+
+FROM valgrind AS adduser
 RUN useradd --shell /bin/bash libgit2 --create-home
 
 FROM adduser AS configure