store: add {Push,Pop}Compose methods and hide channel

Wrap the channel in Pop and Push methods, so it is not exposed to
the callers. PushCompose replaces the old AddCompose for consistency,
and PopCompose simply reads from the other end of the channel.

Signed-off-by: Tom Gundersen <teg@jklm.no>

cmd/osbuild-composer/main.go

@@ -8,7 +8,6 @@ import (
 	"path/filepath"
 
 	"osbuild-composer/internal/blueprint"
-	"osbuild-composer/internal/job"
 	"osbuild-composer/internal/jobqueue"
 	"osbuild-composer/internal/rpmmd"
 	"osbuild-composer/internal/store"
@@ -63,9 +62,8 @@ func main() {
 	}
 
 	stateChannel := make(chan []byte, 10)
-	jobChannel := make(chan job.Job, 200)
 
-	store := store.New(state, stateChannel, jobChannel)
+	store := store.New(state, stateChannel)
 	// sample blueprint on first run
 	if state == nil {
 		store.PushBlueprint(blueprint.Blueprint{
@@ -77,7 +75,7 @@ func main() {
 		})
 	}
 
-	jobAPI := jobqueue.New(logger, store, jobChannel)
+	jobAPI := jobqueue.New(logger, store)
 	weldrAPI := weldr.New(repo, packages, logger, store)
 	go func() {
 		for {