images: Ensure that the gpg2(1), gnupg2(7), etc. manuals are available

It turns out that at least since Fedora 30 [1], the gnupg2 package has
been part of the fedora base image, because it's required by the dnf
package:
  dnf -> python3-dnf -> python3-libdnf -> libdnf -> gpgme -> gnupg2

Hence, the need to restore the gnupg2 documentation that was stripped
out in the base image.

Only the images for currently maintained Fedoras (ie., 36, 37 and 38)
were updated.

[1] It's difficult to find out if the gnupg2 package wasn't part of the
    fedora base image before Fedora 30, because those images are no
    longer available from registry.fedoraproject.org.

https://github.com/containers/toolbox/pull/1228

images/fedora/f36/ensure-files

@@ -6,6 +6,9 @@
 /usr/share/man/man1/cp.1*
 /usr/share/man/man1/ls.1*
 
+/usr/share/man/man1/gpg2.1*
+/usr/share/man/man7/gnupg2.7*
+
 /usr/share/man/fr/man8/rpm.8*
 /usr/share/man/ja/man8/rpm.8*
 /usr/share/man/man8/rpm.8*

images/fedora/f36/missing-docs

@@ -4,6 +4,7 @@ coreutils-common
 curl
 findutils
 gawk
+gnupg2
 grep
 gzip
 libcap

images/fedora/f37/ensure-files

@@ -6,6 +6,9 @@
 /usr/share/man/man1/cp.1*
 /usr/share/man/man1/ls.1*
 
+/usr/share/man/man1/gpg2.1*
+/usr/share/man/man7/gnupg2.7*
+
 /usr/share/man/fr/man8/rpm.8*
 /usr/share/man/ja/man8/rpm.8*
 /usr/share/man/man8/rpm.8*

images/fedora/f37/missing-docs

@@ -4,6 +4,7 @@ coreutils-common
 curl
 findutils
 gawk
+gnupg2
 grep
 gzip
 libcap

images/fedora/f38/ensure-files

@@ -6,6 +6,9 @@
 /usr/share/man/man1/cp.1*
 /usr/share/man/man1/ls.1*
 
+/usr/share/man/man1/gpg2.1*
+/usr/share/man/man7/gnupg2.7*
+
 /usr/share/man/fr/man8/rpm.8*
 /usr/share/man/ja/man8/rpm.8*
 /usr/share/man/man8/rpm.8*

images/fedora/f38/missing-docs

@@ -4,6 +4,7 @@ coreutils-common
 curl
 findutils
 gawk
+gnupg2
 grep
 gzip
 libcap