copr: Use dnf builddep

Yet *another* copy of our build dependencies here...
The core problem right now is that we embed pre-built manpages
as part of the "source"...which means we need all of our
build dependencies there.

It's tempting to switch to not generating man pages.

Signed-off-by: Colin Walters <[email protected]>

Author: cgwalters

.copr/Makefile

@@ -1,5 +1,6 @@
 srpm:
-	dnf -y install cargo git openssl-devel ostree-devel
+	dnf -y install dnf-utils
+	dnf -y builddep bootc
 	# similar to https://github.com/actions/checkout/issues/760, but for COPR
 	git config --global --add safe.directory '*'
 	cargo install cargo-vendor-filterer