snap: Install postcss v8 explicitly as it is now a peer dependency

Fix Snap build failures since 2020-09-21

diff --git a/snap/snapcraft.yaml b/snap/snapcraft.yaml
index 34844858edb069f0ae68fed8635f80ec5c58d190..d1d73df047443062d7f25a64ef156ae415a733c2 100644 (file)
--- a/snap/snapcraft.yaml
+++ b/snap/snapcraft.yaml
@@ -70,12 +70,14 @@ parts:
     node-packages:
         - "@babel/cli"
         - "@babel/core"
+        - postcss
         - postcss-cli
     filesets:
       node:
         - bin/node
       postcss:
         - bin/postcss
+        - lib/node_modules/postcss/*
         - lib/node_modules/postcss-cli/*
       babel:
         - bin/babel