Switch databse driver to 'modernc.org/sqlite'

This modification removes the dependency on CGO during compilation
and makes the resulting binary more portable across distributions
(e.g., runs on Ubuntu 18.04 despite being built on Ubuntu 20.04) as
well as making it easier to support other OSs (i.e., Windows).

Fixes #37

cmgr/database.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 
 	"github.com/jmoiron/sqlx"
-	_ "github.com/mattn/go-sqlite3"
+	_ "modernc.org/sqlite"
 )
 
 const schemaQuery string = `
@@ -179,7 +179,7 @@ func (m *Manager) initDatabase() error {
 		dbPath = "cmgr.db"
 	}
 
-	db, err := sqlx.Open("sqlite3", dbPath+"?_fk=true")
+	db, err := sqlx.Open("sqlite", dbPath+"?_pragma=foreign_keys(1)")
 	if err != nil {
 		m.log.errorf("could not open database: %s", err)
 		return err

go.mod

@@ -10,9 +10,10 @@ require (
 	github.com/docker/go-connections v0.4.0
 	github.com/docker/go-units v0.4.0
 	github.com/jmoiron/sqlx v1.3.4
-	github.com/mattn/go-sqlite3 v1.14.9
+	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/yuin/goldmark v1.4.2
 	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
 	google.golang.org/grpc v1.44.0 // indirect
 	gopkg.in/yaml.v2 v2.4.0
+	modernc.org/sqlite v1.14.6
 )