vim:fugitive: Fix committing with locked gpg-key

.config/git/config

@@ -31,6 +31,8 @@
 	path = /usr/bin/meld
 [include]
 	path = user.config
+[gpg]
+	program = ~/.config/gnupg/gpg.loopback
 [init]
 	defaultBranch = main
 [merge]

.config/gnupg/gpg.loopback

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Taken from:
+# https://github.com/tpope/vim-fugitive/issues/1836#issuecomment-918677504
+#
+# > Put this in /usr/local/bin/gpg or anywhere else that outranks /usr/bin in
+# > PATH. Alternatively, give this script a different name, and configure
+# > gpg.program in Git to point at it.
+
+[ -z "$FUGITIVE" ] || set -- --pinentry-mode loopback "$@"
+
+exec /usr/bin/gpg "$@"