add versioned migrations

Up until this commit, headscale has had one massive migration func that
runs every time the server starts. This means that every time we have
migrated anything, we have added stuff to it and not really taken into
account how the database of clients look like. This means that sometimes
the new stuff has had to be added in the middle, as it would break things
further down.

It is kind of a miracle that it has worked so far with no permament damage,
particularly considering some of our larger migrations like Machine -> Node
or Namespace -> User.

This commit addresses this by adding gormigrate, which is a simple versioned
migration system. As we have to maintain our messy past, the first migration
is the large, currently working, but hard to change function. Subsequent changes
should be added with new IDs after this.

Signed-off-by: Kristoffer Dalby <kristoffer@tailscale.com>

CHANGELOG.md

@@ -32,6 +32,7 @@ after improving the test harness as part of adopting [#1460](https://github.com/
 
 ### Changes
 
+Use versioned migrations [#1644](https://github.com/juanfont/headscale/pull/1644)
 Make the OIDC callback page better [#1484](https://github.com/juanfont/headscale/pull/1484)
 SSH support [#1487](https://github.com/juanfont/headscale/pull/1487)
 State management has been improved [#1492](https://github.com/juanfont/headscale/pull/1492)

flake.nix

@@ -31,7 +31,7 @@
 
           # When updating go.mod or go.sum, a new sha will need to be calculated,
           # update this if you have a mismatch after doing a change to thos files.
-          vendorHash = "sha256-7yqJbF0GkKa3wjiGWJ8BZSJyckrpwmCiX77/aoPGmRc=";
+          vendorHash = "sha256-u9AmJguQ5dnJpfhOeLN43apvMHuraOrJhvlEIp9RoIc=";
 
           ldflags = ["-s" "-w" "-X github.com/juanfont/headscale/cmd/headscale/cli.Version=v${version}"];
         };

go.mod

@@ -75,6 +75,7 @@ require (
 	github.com/fsnotify/fsnotify v1.7.0 // indirect
 	github.com/fxamacker/cbor/v2 v2.5.0 // indirect
 	github.com/glebarez/go-sqlite v1.21.2 // indirect
+	github.com/go-gormigrate/gormigrate/v2 v2.1.1 // indirect
 	github.com/go-jose/go-jose/v3 v3.0.1 // indirect
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang-jwt/jwt v3.2.2+incompatible // indirect

go.sum

@@ -101,6 +101,8 @@ github.com/glebarez/go-sqlite v1.21.2 h1:3a6LFC4sKahUunAmynQKLZceZCOzUthkRkEAl9g
 github.com/glebarez/go-sqlite v1.21.2/go.mod h1:sfxdZyhQjTM2Wry3gVYWaW072Ri1WMdWJi0k6+3382k=
 github.com/glebarez/sqlite v1.10.0 h1:u4gt8y7OND/cCei/NMHmfbLxF6xP2wgKcT/BJf2pYkc=
 github.com/glebarez/sqlite v1.10.0/go.mod h1:IJ+lfSOmiekhQsFTJRx/lHtGYmCdtAiTaf5wI9u5uHA=
+github.com/go-gormigrate/gormigrate/v2 v2.1.1 h1:eGS0WTFRV30r103lU8JNXY27KbviRnqqIDobW3EV3iY=
+github.com/go-gormigrate/gormigrate/v2 v2.1.1/go.mod h1:L7nJ620PFDKei9QOhJzqA8kRCk+E3UbV2f5gv+1ndLc=
 github.com/go-jose/go-jose/v3 v3.0.1 h1:pWmKFVtt+Jl0vBZTIpz/eAKwsm6LkIxDVVbFHKkchhA=
 github.com/go-jose/go-jose/v3 v3.0.1/go.mod h1:RNkWWRld676jZEYoV3+XK8L2ZnNSvIsxFMht0mSX+u8=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=