CI: caching: keep-going (#2535)

This solves the `build all` problem when all projects can't infer the consitent
package version.

Also would allow caching workflow on manual start - to work & cache in a broken
or complex PRs.

Author: Anton-Latukha

.github/workflows/caching.yml

@@ -45,7 +45,7 @@ on:
     - cron: "25 2/8 * * *"
 
 env:
-  cabalBuild: "v2-build all --enable-tests --enable-benchmarks"
+  cabalBuild: "v2-build all --enable-tests --enable-benchmarks --keep-going"
 
 jobs: