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/config.go

@@ -0,0 +1,59 @@
+// Code generated by entc, DO NOT EDIT.
+
+package ent
+
+import (
+	"entgo.io/ent"
+	"entgo.io/ent/dialect"
+)
+
+// Option function to configure the client.
+type Option func(*config)
+
+// Config is the configuration for the client and its builder.
+type config struct {
+	// driver used for executing database requests.
+	driver dialect.Driver
+	// debug enable a debug logging.
+	debug bool
+	// log used for logging on debug mode.
+	log func(...interface{})
+	// hooks to execute on mutations.
+	hooks *hooks
+}
+
+// hooks per client, for fast access.
+type hooks struct {
+	DbPackage []ent.Hook
+}
+
+// Options applies the options on the config object.
+func (c *config) options(opts ...Option) {
+	for _, opt := range opts {
+		opt(c)
+	}
+	if c.debug {
+		c.driver = dialect.Debug(c.driver, c.log)
+	}
+}
+
+// Debug enables debug logging on the ent.Driver.
+func Debug() Option {
+	return func(c *config) {
+		c.debug = true
+	}
+}
+
+// Log sets the logging function for debug mode.
+func Log(fn func(...interface{})) Option {
+	return func(c *config) {
+		c.log = fn
+	}
+}
+
+// Driver configures the client driver.
+func Driver(driver dialect.Driver) Option {
+	return func(c *config) {
+		c.driver = driver
+	}
+}