include 3.8.0rc1 in manylinux1 (#360)

* include 3.8.0rc1 in manylinux1

* add keyserver

* update key for 3.8

* fixes from review

Author: mattip

docker/build_scripts/build_env.sh

@@ -1,7 +1,7 @@
 # source me
 
 PYTHON_DOWNLOAD_URL=https://www.python.org/ftp/python
-CPYTHON_VERSIONS="2.7.16 3.4.10 3.5.7 3.6.9 3.7.4"
+CPYTHON_VERSIONS="2.7.16 3.4.10 3.5.7 3.6.9 3.7.4 3.8.0rc1"
 
 # openssl version to build, with expected sha256 hash of .tar.gz
 # archive.

docker/build_scripts/build_utils.sh

@@ -76,7 +76,7 @@ function build_cpython {
     local py_dist_dir=$(pyver_dist_dir $py_ver)
     curl -fsSLO $PYTHON_DOWNLOAD_URL/$py_dist_dir/Python-$py_ver.tgz
     curl -fsSLO $PYTHON_DOWNLOAD_URL/$py_dist_dir/Python-$py_ver.tgz.asc
-    gpg --verify Python-$py_ver.tgz.asc
+    gpg --verify --no-auto-key-locate Python-$py_ver.tgz.asc
     if [ $(lex_pyver $py_ver) -lt $(lex_pyver 3.3) ]; then
         do_cpython_build $py_ver ucs2
         do_cpython_build $py_ver ucs4
@@ -94,6 +94,8 @@ function build_cpythons {
     # Import public keys used to verify downloaded Python source tarballs.
     # https://www.python.org/static/files/pubkeys.txt
     gpg --import ${MY_DIR}/cpython-pubkeys.txt
+    # Add version 3.8 release manager's key https://keybase.io/ambv/
+    gpg --keyserver keys.gnupg.net --recv-keys E3FF2839C048B25C084DEBE9B26995E310250568
     for py_ver in $@; do
         build_cpython $py_ver
     done