Default Homebrew on Linux to use GitHub Packages.

Library/Homebrew/brew.sh

@@ -446,7 +446,7 @@ if [[ -n "$HOMEBREW_MACOS" || -n "$HOMEBREW_FORCE_HOMEBREW_ON_LINUX" ]]
 then
   HOMEBREW_BOTTLE_DEFAULT_DOMAIN="https://ghcr.io/v2/homebrew/core"
 else
-  HOMEBREW_BOTTLE_DEFAULT_DOMAIN="https://linuxbrew.bintray.com"
+  HOMEBREW_BOTTLE_DEFAULT_DOMAIN="https://ghcr.io/v2/linuxbrew/core"
 fi
 
 HOMEBREW_USER_AGENT="$HOMEBREW_PRODUCT/$HOMEBREW_USER_AGENT_VERSION ($HOMEBREW_SYSTEM; $HOMEBREW_PROCESSOR $HOMEBREW_OS_USER_AGENT_VERSION)"

Library/Homebrew/cmd/vendor-install.sh

@@ -19,8 +19,6 @@ then
   then
     ruby_FILENAME="portable-ruby-2.6.3_2.yosemite.bottle.tar.gz"
     ruby_SHA="b065e5e3783954f3e65d8d3a6377ca51649bfcfa21b356b0dd70490f74c6bd86"
-    ruby_URL="https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:$ruby_SHA"
-    ruby_URL2="https://homebrew.bintray.com/bottles-portable-ruby/$ruby_FILENAME"
   fi
 elif [[ -n "$HOMEBREW_LINUX" ]]
 then
@@ -28,12 +26,18 @@ then
     x86_64)
       ruby_FILENAME="portable-ruby-2.6.3_2.x86_64_linux.bottle.tar.gz"
       ruby_SHA="97e639a64dcec285392b53ad804b5334c324f1d2a8bdc2b5087b8bf8051e332f"
-      ruby_URL="$HOMEBREW_BOTTLE_DOMAIN/bottles-portable-ruby/$ruby_FILENAME"
-      ruby_URL2="https://github.com/Homebrew/homebrew-portable-ruby/releases/download/2.6.3_2/$ruby_FILENAME"
       ;;
   esac
 fi
 
+# Dynamic variables can't be detected by shellcheck
+# shellcheck disable=SC2034
+if [[ -n "$ruby_SHA" && -n "$ruby_FILENAME" ]]
+then
+  ruby_URL="https://ghcr.io/v2/homebrew/portable-ruby/portable-ruby/blobs/sha256:$ruby_SHA"
+  ruby_URL2="https://github.com/Homebrew/homebrew-portable-ruby/releases/download/2.6.3_2/$ruby_FILENAME"
+fi
+
 check_linux_glibc_version() {
   if [[ -z $HOMEBREW_LINUX || -z $HOMEBREW_LINUX_MINIMUM_GLIBC_VERSION ]]
   then

Library/Homebrew/env_config.rb

@@ -53,7 +53,7 @@ module Homebrew
                       "If bottles are not available at `HOMEBREW_BOTTLE_DOMAIN` " \
                       "they will be downloaded from the default bottle domain.",
         default_text: "macOS: `https://ghcr.io/v2/homebrew/core`, " \
-                      "Linux: `https://linuxbrew.bintray.com`.",
+                      "Linux: `https://ghcr.io/v2/linuxbrew/core`.",
         default:      HOMEBREW_BOTTLE_DEFAULT_DOMAIN,
       },
       HOMEBREW_BREW_GIT_REMOTE:               {

docs/Manpage.md

@@ -1750,7 +1750,7 @@ example, run `export HOMEBREW_NO_INSECURE_REDIRECT=1` rather than just
 - `HOMEBREW_BOTTLE_DOMAIN`
   <br>Use this URL as the download mirror for bottles. If bottles at that URL are temporarily unavailable, the default bottle domain will be used as a fallback mirror. For example, `HOMEBREW_BOTTLE_DOMAIN=http://localhost:8080` will cause all bottles to download from the prefix `http://localhost:8080/`. If bottles are not available at `HOMEBREW_BOTTLE_DOMAIN` they will be downloaded from the default bottle domain.
 
-  *Default:* macOS: `https://ghcr.io/v2/homebrew/core`, Linux: `https://linuxbrew.bintray.com`.
+  *Default:* macOS: `https://ghcr.io/v2/homebrew/core`, Linux: `https://ghcr.io/v2/linuxbrew/core`.
 
 - `HOMEBREW_BREW_GIT_REMOTE`
   <br>Use this URL as the Homebrew/brew `git`(1) remote.

manpages/brew.1

@@ -2458,7 +2458,7 @@ If set, use Bootsnap to speed up repeated \fBbrew\fR calls\. A no\-op when using
 Use this URL as the download mirror for bottles\. If bottles at that URL are temporarily unavailable, the default bottle domain will be used as a fallback mirror\. For example, \fBHOMEBREW_BOTTLE_DOMAIN=http://localhost:8080\fR will cause all bottles to download from the prefix \fBhttp://localhost:8080/\fR\. If bottles are not available at \fBHOMEBREW_BOTTLE_DOMAIN\fR they will be downloaded from the default bottle domain\.
 .
 .IP
-\fIDefault:\fR macOS: \fBhttps://ghcr\.io/v2/homebrew/core\fR, Linux: \fBhttps://linuxbrew\.bintray\.com\fR\.
+\fIDefault:\fR macOS: \fBhttps://ghcr\.io/v2/homebrew/core\fR, Linux: \fBhttps://ghcr\.io/v2/linuxbrew/core\fR\.
 .
 .TP
 \fBHOMEBREW_BREW_GIT_REMOTE\fR