Cross.toml: Install tzdata in container

Linux tests require that now, as we now assume /usr/share/zoneinfo
is present.

Author: drinkcat

.github/workflows/CICD.yml

@@ -654,10 +654,6 @@ jobs:
             ;;
         esac
         outputs CARGO_TEST_OPTIONS
-        # ** pass needed environment into `cross` container (iff `cross` not already configured via "Cross.toml")
-        if [ "${CARGO_CMD}" = 'cross' ] && [ ! -e "Cross.toml" ] ; then
-          printf "[build.env]\npassthrough = [\"CI\", \"RUST_BACKTRACE\", \"CARGO_TERM_COLOR\"]\n" > Cross.toml
-        fi
         # * executable for `strip`?
         STRIP="strip"
         case ${{ matrix.job.target }} in

Cross.toml

@@ -0,0 +1,7 @@
+# spell-checker:ignore (misc) dpkg noninteractive tzdata
+[build]
+pre-build = [
+  "apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install tzdata",
+]
+[build.env]
+passthrough = ["CI", "RUST_BACKTRACE", "CARGO_TERM_COLOR"]