gocryptfs: github ci: also test on ubuntu-22.04

Additionally, run the test every month so we always have
a recent result available. Github deletes logs after 90 days.

.github/workflows/main.yml

@@ -1,11 +1,17 @@
-on: [push, pull_request]
+on:
+  push:
+  pull_request:
+  schedule:
+    - cron:  '0 12 1 * *' # Every 1st of a month at noon UTC
 
 jobs:
   build:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-18.04, ubuntu-20.04]
+        os: [ubuntu-18.04, ubuntu-20.04, ubuntu-22.04]
+      # Don't cancel everything when one version fails
+      fail-fast: false
     steps:
     - uses: actions/checkout@v2
     - name: apt-get
@@ -14,6 +20,6 @@ jobs:
         sudo apt-get -qq install xfslibs-dev uuid-dev libtool-bin \
           e2fsprogs automake gcc libuuid1 quota attr libattr1-dev make \
           libacl1-dev libaio-dev xfsprogs libgdbm-dev gawk fio dbench \
-          uuid-runtime python sqlite3 fuse
+          uuid-runtime python3 sqlite3 fuse
     - name: make
       run: make -j $(nproc)