Use shasum -a 256 because sha256 is not available in ci (#271)

Author: anttiharju

dist/brew/template.rb

@@ -1,6 +1,5 @@
 # frozen_string_literal: true
 
-# testing
 class ${class_name} < Formula
   desc '${description}'
   homepage '${homepage}'

dist/brew/values.bash

@@ -18,7 +18,7 @@ capture class_name "$(awk 'BEGIN{print toupper(substr("'"$repo_name"'",1,1)) sub
 capture description "$(gh repo view --json description --jq .description)"
 capture homepage "$(gh api "repos/$GITHUB_REPOSITORY" --jq .homepage)"
 capture version "${TAG#v}"
-capture darwin_amd64_sha256 "$(sha256 "$REPO_ROOT/vmatch-darwin-amd64.tar.gz" | cut -d= -f2 | tr -d ' ')"
-capture darwin_arm64_sha256 "$(sha256 "$REPO_ROOT/vmatch-darwin-arm64.tar.gz" | cut -d= -f2 | tr -d ' ')"
-capture linux_amd64_sha256 "$(sha256 "$REPO_ROOT/vmatch-linux-amd64.tar.gz" | cut -d= -f2 | tr -d ' ')"
-capture linux_arm64_sha256 "$(sha256 "$REPO_ROOT/vmatch-linux-arm64.tar.gz" | cut -d= -f2 | tr -d ' ')"
+capture darwin_amd64_sha256 "$(shasum -a 256 "$REPO_ROOT/vmatch-darwin-amd64.tar.gz" | cut -d ' ' -f1)"
+capture darwin_arm64_sha256 "$(shasum -a 256 "$REPO_ROOT/vmatch-darwin-arm64.tar.gz" | cut -d ' ' -f1)"
+capture linux_amd64_sha256 "$(shasum -a 256 "$REPO_ROOT/vmatch-linux-amd64.tar.gz" | cut -d ' ' -f1)"
+capture linux_arm64_sha256 "$(shasum -a 256 "$REPO_ROOT/vmatch-linux-arm64.tar.gz" | cut -d ' ' -f1)"