Document HOMEBREW_{,NO_}BOOTSNAP variables.

Library/Homebrew/env_config.rb

@@ -39,6 +39,10 @@ module Homebrew
       HOMEBREW_BINTRAY_USER:                  {
         description: "Use this username when accessing the Bintray API (where bottles are stored).",
       },
+      HOMEBREW_BOOTSNAP:                      {
+        description: "If set, use Bootsnap to speed up repeated `brew` calls.",
+        boolean:     true,
+      },
       HOMEBREW_BOTTLE_DOMAIN:                 {
         description:  "Use this URL as the download mirror for bottles. " \
                       "For example, `HOMEBREW_BOTTLE_DOMAIN=http://localhost:8080` will cause all bottles to " \
@@ -203,6 +207,10 @@ module Homebrew
                      "`brew install`, `brew upgrade` or `brew tap`.",
         boolean:     true,
       },
+      HOMEBREW_NO_BOOTSNAP:                   {
+        description: "If set, do not use Bootsnap to speed up repeated `brew` calls.",
+        boolean:     true,
+      },
       HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK:     {
         description: "If set, fail on the failure of installation from a bottle rather than " \
                      "falling back to building from source.",

docs/Manpage.md

@@ -1707,6 +1707,9 @@ example, run `export HOMEBREW_NO_INSECURE_REDIRECT=1` rather than just
 - `HOMEBREW_BINTRAY_USER`
   <br>Use this username when accessing the Bintray API (where bottles are stored).
 
+- `HOMEBREW_BOOTSNAP`
+  <br>If set, use Bootsnap to speed up repeated `brew` calls.
+
 - `HOMEBREW_BOTTLE_DOMAIN`
   <br>Use this URL as the download mirror for bottles. For example, `HOMEBREW_BOTTLE_DOMAIN=http://localhost:8080` will cause all bottles to download from the prefix `http://localhost:8080/`.
 
@@ -1839,6 +1842,9 @@ example, run `export HOMEBREW_NO_INSECURE_REDIRECT=1` rather than just
 - `HOMEBREW_NO_AUTO_UPDATE`
   <br>If set, do not automatically update before running `brew install`, `brew upgrade` or `brew tap`.
 
+- `HOMEBREW_NO_BOOTSNAP`
+  <br>If set, do not use Bootsnap to speed up repeated `brew` calls.
+
 - `HOMEBREW_NO_BOTTLE_SOURCE_FALLBACK`
   <br>If set, fail on the failure of installation from a bottle rather than falling back to building from source.
 

manpages/brew.1

@@ -2376,6 +2376,12 @@ Use this API key when accessing the Bintray API (where bottles are stored)\.
 Use this username when accessing the Bintray API (where bottles are stored)\.
 .
 .TP
+\fBHOMEBREW_BOOTSNAP\fR
+.
+.br
+If set, use Bootsnap to speed up repeated \fBbrew\fR calls\.
+.
+.TP
 \fBHOMEBREW_BOTTLE_DOMAIN\fR
 .
 .br
@@ -2622,6 +2628,12 @@ If set, do not send analytics\. For more information, see: \fIhttps://docs\.brew
 If set, do not automatically update before running \fBbrew install\fR, \fBbrew upgrade\fR or \fBbrew tap\fR\.
 .
 .TP
+\fBHOMEBREW_NO_BOOTSNAP\fR
+.
+.br
+If set, do not use Bootsnap to speed up repeated \fBbrew\fR calls\.
+.
+.TP
 \fBHOMEBREW_NO_BOTTLE_SOURCE_FALLBACK\fR
 .
 .br