Attempt workaround for netlify CGO issues

https://github.com/netlify/build-image/issues/183#issuecomment-419199649

netlify.toml

@@ -1,6 +1,6 @@
 [build]
     publish = "public/"
-    command = "./scripts/release.sh"
+    command = "./scripts/netlify.sh"
 
 [build.environment]
     HUGO_VERSION = "0.47.1"

scripts/netlify.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+# https://github.com/netlify/build-image/issues/183#issuecomment-419199649
+
+HUGO_FLAVOUR="hugo_extended"
+
+rm -rf *.deb
+wget --no-clobber http://security.ubuntu.com/ubuntu/pool/main/g/gcc-5/libstdc++6_5.4.0-6ubuntu1~16.04.10_amd64.deb || exit 1
+wget --no-clobber https://github.com/gohugoio/hugo/releases/download/v${HUGO_VERSION}/${HUGO_FLAVOUR}_${HUGO_VERSION}_Linux-64bit.deb || exit 1
+grep "hugo=" ~/.bashrc || echo "alias hugo='LD_LIBRARY_PATH=$(pwd)/tmp/usr/lib/x86_64-linux-gnu $(pwd)/tmp/usr/local/bin/hugo'" >> ~/.bashrc
+find -name '*.deb' -exec dpkg -x {} $(pwd)/tmp \;
+rm -rf *.deb
+
+export LD_LIBRARY_PATH=$(pwd)/tmp/usr/lib/x86_64-linux-gnu
+export PATH=$(pwd)/tmp/usr/local/bin:$PATH
+
+./scripts/release.sh