Bump test environment to Ubuntu 22.04 (#242)

This also fixes a few test installers:

- rustfmt is available via apt-get in 22.04, use that instead of tarball
that's no longer available
- brittany now installs cleanly in the default haskell ghc/cabal in
22.04, so just use that
- perltidy in 22.04 has slightly different output
- nixfmt download url changed (now includes OS/arch). There was
initially no binary available when nixfmt was updated,
but the devs there were kind enough to provide one:
https://github.com/serokell/nixfmt/issues/139

This runs a full `make fmt-build` without errors, though it takes a
while ;). All tests pass, too.

1 files changed, 3 insertions, 3 deletions

diff --git a/test/formatters/samplecode/perltidy/out.pl b/test/formatters/samplecode/perltidy/out.pl
index 7cc9d40..b22e297 100644
--- a/test/formatters/samplecode/perltidy/out.pl
+++ b/test/formatters/samplecode/perltidy/out.pl
@@ -5,7 +5,7 @@ while ( read +STDIN, $_, 2048 ) {
     $c = 142;
     $t = 255;
     @t = map {
-        $_ % 16
+             $_ % 16
           or $t ^= $c ^=
           ( $m = ( 11, 10, 116, 100, 11, 122, 20, 100 )[ $_ / 16 % 8 ] ) & 110;
         $t ^= (
@@ -15,8 +15,8 @@ while ( read +STDIN, $_, 2048 ) {
         )[ $_ % 8 ]
     } ( 16 .. 271 );
     if ( ( @a = unx "C*", $_ )[20] & 48 ) {
-        $h   = 5;
-        $_   = unxb24, join "",
+        $h = 5;
+        $_ = unxb24, join "",
           @b = map { xB8, unxb8, chr( $_ ^ $a[ --$h + 84 ] ) } @ARGV;
         s/...$/1$&/;
         $d = unxV, xb25, $_;