Update Guix and use age & sops via Guix

Author: jchristgit

guix/README.md

@@ -16,8 +16,6 @@ as a playground for ideas.
     --generate-key` as root.
   - This is needed for the remote Guix instance to accept packages we build
     locally.
-- [`sops`](https://github.com/getsops/sops) installed locally, along with
-  [`age`](https://github.com/FiloSottile/age).
 
 
 **Host prerequisites**
@@ -52,5 +50,5 @@ guix deploy deployment.scm
 # and wish to use the pinned versions (as you should):
 guix time-machine -C channels-lock.scm -- deploy deployment.scm
 # If you wish to sandbox the whole thing in a container:
-guix shell --preserve=^SSH_AUTH_SOCK --expose=/etc/guix --expose=$HOME/.ssh --share=$SSH_AUTH_SOCK --container --network --nesting guix nss-certs -- guix time-machine -C channels-lock.scm -- deploy deployment.scm
+guix shell --preserve=^SSH_AUTH_SOCK --expose=/etc/guix --expose=$HOME/.ssh --share=$SSH_AUTH_SOCK --container --network --nesting guix nss-certs age sops -- guix time-machine -C channels-lock.scm -- deploy deployment.scm
 ```

guix/channels-lock.scm

@@ -12,7 +12,7 @@
        (name 'guix)
        (url "https://git.guix.gnu.org/guix.git")
        (branch "master")
-       (commit "7c3231930be10e6b526d718628d85b975c88c6d1")
+       (commit "20b9a9ed9896e36f1750a2b0002ab247340983fe")
        (introduction
         (make-channel-introduction
          "9edb3f66fd807b096b48283debdcddccfea34bad"