Fix sqlite bigint primary keys

Fixes the following error

> AUTOINCREMENT is only allowed on an INTEGER PRIMARY KEY

by applying the workaround from SeaQL/sea-orm#1832

Author: fgaz

Diff for: server/src/database/entity/cache.rs

@@ -14,6 +14,8 @@ pub type CacheModel = Model;
 pub struct Model {
     /// Unique numeric ID of the cache.
     #[sea_orm(primary_key)]
+    // https://github.com/SeaQL/sea-orm/issues/1832
+    #[cfg_attr(feature = "sqlite", sea_orm(column_type = "Integer"))]
     pub id: i64,
 
     /// Unique name of the cache.

Diff for: server/src/database/entity/chunk.rs

@@ -44,6 +44,8 @@ pub enum ChunkState {
 pub struct Model {
     /// Unique numeric ID of the chunk.
     #[sea_orm(primary_key)]
+    // https://github.com/SeaQL/sea-orm/issues/1832
+    #[cfg_attr(feature = "sqlite", sea_orm(column_type = "Integer"))]
     pub id: i64,
 
     /// The state of the chunk.

Diff for: server/src/database/entity/chunkref.rs

@@ -21,6 +21,8 @@ pub type ChunkRefModel = Model;
 pub struct Model {
     /// Unique numeric ID of the link.
     #[sea_orm(primary_key)]
+    // https://github.com/SeaQL/sea-orm/issues/1832
+    #[cfg_attr(feature = "sqlite", sea_orm(column_type = "Integer"))]
     pub id: i64,
 
     /// ID of the NAR.

Diff for: server/src/database/entity/nar.rs

@@ -68,6 +68,8 @@ pub enum NarState {
 pub struct Model {
     /// Unique numeric ID of the NAR.
     #[sea_orm(primary_key)]
+    // https://github.com/SeaQL/sea-orm/issues/1832
+    #[cfg_attr(feature = "sqlite", sea_orm(column_type = "Integer"))]
     pub id: i64,
 
     /// The state of the NAR archive.

Diff for: server/src/database/entity/object.rs

@@ -21,6 +21,8 @@ pub type ObjectModel = Model;
 pub struct Model {
     /// Unique numeric ID of the object.
     #[sea_orm(primary_key)]
+    // https://github.com/SeaQL/sea-orm/issues/1832
+    #[cfg_attr(feature = "sqlite", sea_orm(column_type = "Integer"))]
     pub id: i64,
 
     /// ID of the binary cache the object belongs to.