refactor: separated GitRepo types into own module

feat: added more query params for GitRepo API

src/models/git.v

@@ -0,0 +1,52 @@
+module models
+
+pub struct GitRepoArch {
+pub:
+	id      int    [primary; sql: serial]
+	repo_id int    [nonull]
+	value   string [nonull]
+}
+
+// str returns a string representation.
+pub fn (gra &GitRepoArch) str() string {
+	return gra.value
+}
+
+pub struct GitRepo {
+pub mut:
+	id int [primary; sql: serial]
+	// URL of the Git repository
+	url string [nonull]
+	// Branch of the Git repository to use
+	branch string [nonull]
+	// Which repo the builder should publish packages to
+	repo string [nonull]
+	// Cron schedule describing how frequently to build the repo.
+	schedule string
+	// On which architectures the package is allowed to be built. In reality,
+	// this controls which builders will periodically build the image.
+	arch []GitRepoArch [fkey: 'repo_id']
+}
+
+// str returns a string representation.
+pub fn (gr &GitRepo) str() string {
+	mut parts := [
+		'id: $gr.id',
+		'url: $gr.url',
+		'branch: $gr.branch',
+		'repo: $gr.repo',
+		'schedule: $gr.schedule',
+		'arch: ${gr.arch.map(it.value).join(', ')}',
+	]
+	str := parts.join('\n')
+
+	return str
+}
+
+[params]
+pub struct GitRepoFilter {
+pub mut:
+	limit  u64 = 25
+	offset u64
+	repo   string
+}