Docker: remove hard-coded py3 version in boost installer

docker/build/installers/install_boost.sh

@@ -46,11 +46,13 @@ download_if_not_cached "${PKG_NAME}" "${CHECKSUM}" "${DOWNLOAD_LINK}"
 
 tar xjf "${PKG_NAME}"
 
+py3_ver="$(py3_version)"
+
 # Ref: https://www.boost.org/doc/libs/1_73_0/doc/html/mpi/getting_started.html
 pushd "boost_${VERSION}"
     echo "using mpi : ${SYSROOT_DIR}/bin/mpicc ;" > user-config.jam
     ./bootstrap.sh \
-        --with-python-version=3.6 \
+        --with-python-version=${py3_ver} \
         --prefix="${SYSROOT_DIR}" \
         --without-icu
 

docker/build/installers/installer_base.sh

@@ -36,6 +36,13 @@ export LOCAL_HTTP_ADDR="http://172.17.0.1:8388"
 
 export SUPPORTED_NVIDIA_SMS="6.0 6.1 7.0 7.2 7.5"
 
+function py3_version() {
+    local version
+    # major.minor.rev (e.g. 3.6.9) expected
+    version="$(python3 --version | awk '{print $2}')"
+    echo "${version%.*}"
+}
+
 # Ref: https://reproducible-builds.org/docs/source-date-epoch
 function source_date_epoch_setup() {
     DATE_FMT="+%Y-%m-%d"