Add database backend (SQLite) (#26)

Add database with background information for each pkgbase, for possible future use.
A static status page is generated from the db.

Currently includes:

* sub-packages
* build-time
* build-duration
* status (failed, latest, skipped, queued, building, build)
* version (both from PKGBUILD and repo)
* last checked

Database is currently only used for informational purposes. Goal is to refactor many (expensive) methods to use the db instead of searching/parsing files.

Reviewed-on: https://git.harting.dev/anonfunc/ALHP.GO/pulls/26
Co-authored-by: Giovanni Harting <539@idlegandalf.com>
Co-committed-by: Giovanni Harting <539@idlegandalf.com>

ent/schema/dbpackage.go

@@ -0,0 +1,33 @@
+package schema
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/schema/field"
+)
+
+// DbPackage holds the schema definition for the DbPackage entity.
+type DbPackage struct {
+	ent.Schema
+}
+
+// Fields of the DbPackage.
+func (DbPackage) Fields() []ent.Field {
+	return []ent.Field{
+		field.String("pkgbase").NotEmpty().Immutable().Unique(),
+		field.Strings("packages").Optional(),
+		field.Int("status").Optional().Min(0),
+		field.String("skip_reason").Optional(),
+		field.String("repository").NotEmpty(),
+		field.String("march").NotEmpty(),
+		field.String("version").Optional(),
+		field.String("repo_version").Optional(),
+		field.Time("build_time").Optional(),
+		field.Uint64("build_duration").Positive().Optional(),
+		field.Time("updated").Optional(),
+	}
+}
+
+// Edges of the DbPackage.
+func (DbPackage) Edges() []ent.Edge {
+	return nil
+}