packit: Build PRs into default packit COPRs

Building all PRs of all container projects into the same COPR does not
properly isolate PRs from each other.

To avoid that, change the copr_build configuration to use the packit
default COPRs, which are specific to the particular PR, and disappear
after a few weeks. Depending projects should only run against what
landed in gvisor-tap-vsock/main i.e. the podman-next COPR.

Unmerging the two copr jobs allows us the redundant targets: list for the
"main" builds into podman-next. Specifying the target list is not necessary
any more since packit/packit-service#1499 got fixed.

Signed-off-by: Martin Pitt <mpitt@redhat.com>

.packit.yaml

@@ -9,52 +9,35 @@
 specfile_path: rpm/gvisor-tap-vsock.spec
 upstream_tag_template: v{version}
 
+srpm_build_deps:
+  - make
+
 jobs:
-  - &copr
-    job: copr_build
+  - job: copr_build
     trigger: pull_request
-    owner: rhcontainerbot
-    project: packit-builds
     enable_net: true
-    srpm_build_deps:
-      - make
+    # keep in sync with https://copr.fedorainfracloud.org/coprs/rhcontainerbot/podman-next
     targets:
       - fedora-rawhide-aarch64
       - fedora-rawhide-x86_64
       - fedora-eln-aarch64
       - fedora-eln-x86_64
       - fedora-38-aarch64
       - fedora-38-x86_64
-      - centos-stream-9-aarch64
-      - centos-stream-9-x86_64
-      - centos-stream-8-aarch64
-      - centos-stream-8-x86_64
+      - centos-stream+epel-next-8-x86_64
+      - centos-stream+epel-next-8-aarch64
+      - centos-stream+epel-next-9-x86_64
+      - centos-stream+epel-next-9-aarch64
+    additional_repos:
+      - "copr://rhcontainerbot/podman-next"
 
-  - <<: *copr
-    # Run on commit to main branch
+  # Run on commit to main branch
+  - job: copr_build
     trigger: commit
+    enable_net: true
     branch: main
+    owner: rhcontainerbot
     project: podman-next
-    targets:
-      - fedora-rawhide-aarch64
-      - fedora-rawhide-ppc64le
-      - fedora-rawhide-s390x
-      - fedora-rawhide-x86_64
-      - fedora-eln-aarch64
-      - fedora-eln-ppc64le
-      - fedora-eln-s390x
-      - fedora-eln-x86_64
-      - fedora-38-aarch64
-      - fedora-38-ppc64le
-      - fedora-38-s390x
-      - fedora-38-x86_64
-      - centos-stream+epel-next-9-aarch64
-      - centos-stream+epel-next-9-ppc64le
-      - centos-stream+epel-next-9-s390x
-      - centos-stream+epel-next-9-x86_64
-      - centos-stream+epel-next-8-aarch64
-      - centos-stream+epel-next-8-ppc64le
-      - centos-stream+epel-next-8-x86_64
 
   - job: propose_downstream
     trigger: release