Merge bitcoin/bitcoin#26077: guix: switch from guix environment to guix shell

66c4b58e518aff08030b3c879c44af7716110619 guix: switch from guix environment to guix shell (fanquake)

Pull request description:

  See https://guix.gnu.org/manual/devel/en/html_node/Invoking-guix-environment.html.

  > Deprecation warning: The guix environment command is deprecated
  in favor of guix shell, which performs similar functions but is more convenient to use. See Invoking guix shell.

  > Being deprecated, guix environment is slated for eventual removal,
  but the Guix project is committed to keeping it until May 1st, 2023. Please get in touch with us at guix-devel@gnu.org if you would like to discuss it.

  See also https://guix.gnu.org/blog/2021/from-guix-environment-to-guix-shell/ for a blog post and additional details.

  Guix `shell` was added to Guix ~1 year ago, in this commit, https://git.savannah.gnu.org/cgit/guix.git/commit/?id=80edb7df6586464aa40e84e103f0045452de95db, which isn't part of the 1.3.0 release binaries out of the box, but invoking a `guix pull`, and updating will make it available. i.e:
  ```bash
  bash-5.1# guix --version
  guix (GNU Guix) 1.3.0
  Copyright (C) 2021 the Guix authors
  License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
  This is free software: you are free to change and redistribute it.
  There is NO WARRANTY, to the extent permitted by law.

  bash-5.1# guix shell
  guix: shell: command not found
  Try 'guix --help' for more information.

  bash-5.1# guix pull
  Updating channel 'guix' from Git repository at 'https://git.savannah.gnu.org/git/guix.git'...
  Authenticating channel 'guix', commits 9edb3f6 to 7a980bb (6,278 new commits)...
  Building from this channel:
    guix      https://git.savannah.gnu.org/git/guix.git7a980bb
  < snip >
  building /gnu/store/2wwwsczxcw61m05p4mv0kf0advx4fqsb-inferior-script.scm.drv...
  building package cache...
  building profile with 1 package...
  New in this revision:
    6,866 new packages: a2jmidid, abjad,

  bash-5.1# guix help shell
  Usage: guix shell [OPTION] PACKAGES... [-- COMMAND...]
  Build an environment that includes PACKAGES and execute COMMAND or an
  interactive shell in that environment.
  ```

ACKs for top commit:
  TheCharlatan:
    ACK 66c4b58e518aff08030b3c879c44af7716110619

Tree-SHA512: caa3fd2ca8d0f261c50ecdda3728a75389d24d89b51293dedc704ee77ab1342b2bb08ca8c871dcb4646229f056ec86cb15500934ded1b0c501a3ffc25aaa8ae6

contrib/guix/README.md

@@ -259,7 +259,7 @@ details.
   Override the number of jobs to run simultaneously, you might want to do so on
   a memory-limited machine. This may be passed to:
 
-  - `guix` build commands as in `guix environment --cores="$JOBS"`
+  - `guix` build commands as in `guix shell --cores="$JOBS"`
   - `make` as in `make --jobs="$JOBS"`
   - `xargs` as in `xargs -P"$JOBS"`
 
@@ -301,7 +301,7 @@ details.
 
 * _**ADDITIONAL_GUIX_ENVIRONMENT_FLAGS**_
 
-  Additional flags to be passed to the invocation of `guix environment` inside
+  Additional flags to be passed to the invocation of `guix shell` inside
   `guix time-machine`.
 
 # Choosing your security model

contrib/guix/guix-build

@@ -365,7 +365,7 @@ EOF
         # Run the build script 'contrib/guix/libexec/build.sh' in the build
         # container specified by 'contrib/guix/manifest.scm'.
         #
-        # Explanation of `guix environment` flags:
+        # Explanation of `guix shell` flags:
         #
         #   --container        run command within an isolated container
         #
@@ -428,7 +428,7 @@ EOF
         #    more information.
         #
         # shellcheck disable=SC2086,SC2031
-        time-machine environment --manifest="${PWD}/contrib/guix/manifest.scm" \
+        time-machine shell --manifest="${PWD}/contrib/guix/manifest.scm" \
                                  --container \
                                  --pure \
                                  --no-cwd \

contrib/guix/guix-codesign

@@ -286,7 +286,7 @@ EOF
         # Run the build script 'contrib/guix/libexec/build.sh' in the build
         # container specified by 'contrib/guix/manifest.scm'.
         #
-        # Explanation of `guix environment` flags:
+        # Explanation of `guix shell` flags:
         #
         #   --container        run command within an isolated container
         #
@@ -343,7 +343,7 @@ EOF
         #    more information.
         #
         # shellcheck disable=SC2086,SC2031
-        time-machine environment --manifest="${PWD}/contrib/guix/manifest.scm" \
+        time-machine shell --manifest="${PWD}/contrib/guix/manifest.scm" \
                                  --container \
                                  --pure \
                                  --no-cwd \

contrib/guix/libexec/build.sh

@@ -5,7 +5,7 @@ export TZ=UTC
 
 # Although Guix _does_ set umask when building its own packages (in our case,
 # this is all packages in manifest.scm), it does not set it for `guix
-# environment`. It does make sense for at least `guix environment --container`
+# shell`. It does make sense for at least `guix shell --container`
 # to set umask, so if that change gets merged upstream and we bump the
 # time-machine to a commit which includes the aforementioned change, we can
 # remove this line.

contrib/guix/libexec/codesign.sh

@@ -5,7 +5,7 @@ export TZ=UTC
 
 # Although Guix _does_ set umask when building its own packages (in our case,
 # this is all packages in manifest.scm), it does not set it for `guix
-# environment`. It does make sense for at least `guix environment --container`
+# shell`. It does make sense for at least `guix shell --container`
 # to set umask, so if that change gets merged upstream and we bump the
 # time-machine to a commit which includes the aforementioned change, we can
 # remove this line.