fix(deps): bump docker deps, switch to moby/moby (#943)

Fixes: https://gitea.com/gitea/runner/issues/859

Migration approach mirrors [actions-oss/act-cli#154](https://github.com/actions-oss/act-cli/pull/154).

### Dependency changes

- `github.com/docker/docker` v25.0.15 → **removed** (v29 doesn't exist as docker/docker; the project moved to moby/moby)
- `github.com/docker/cli` v25.0.7 → v29.4.3
- `github.com/docker/go-connections` v0.6.0 → v0.7.0
- `github.com/docker/docker-credential-helpers` v0.9.5 → v0.9.6
- `github.com/moby/go-archive` added at v0.2.0
- `github.com/moby/moby/api` added at v1.54.2
- `github.com/moby/moby/client` added at v0.4.1
- `github.com/moby/buildkit` removed (only used `dockerignore.ReadAll`, swapped for `moby/patternmatcher/ignorefile.ReadAll` directly)
- `github.com/containerd/errdefs` v0.3.0 → v1.0.0

### Migration

- v28: type aliases moved to their subpackages (`types.{Container,Image,Network,Exec}*` → `container/image/network/...`); deprecated APIs replaced (`ImageInspectWithRaw`, `client.IsErrNotFound`, `archive.CanonicalTarNameForPath`, `opts.ValidateMACAddress`, `ListOpts.GetAll`)
- v29: structural client redesign — every `cli.X(ctx, ...)` call switched to options-everywhere/Result-typed signatures, `ContainerExec*` → `Exec*`, `ContainerWait` returns a struct with `Result`/`Error` channels, `Tty`→`TTY`, `Copy*Container` takes options struct, `client.NewClientWithOpts` → `client.New`. `pkg/stdcopy` moved to `moby/moby/api/pkg/stdcopy`. The vendored copy of `cli/command/container/opts.go` was refreshed from cli v29 (now uses `netip.Addr` for IPs, port-set conversion helpers). A small local `parsePlatform` helper centralises the `os/arch[/variant]` parsing previously inlined into multiple call sites.

### Behaviour preservation

The migration introduced several behavioural shifts vs the v25 client; all were caught in review and reverted/fixed in follow-up commits:

- `GetDockerClient`: cli v29's `Ping(NegotiateAPIVersion: true)` returns errors that the old `NegotiateAPIVersion` silently swallowed. Restored best-effort behaviour (warn-log + continue) so daemons with blocked `_ping` or API < 1.40 keep working. The SSH-helper `client.New` call no longer inherits `client.FromEnv`, matching the old `NewClientWithOpts(WithHost, WithDialContext)` so `DOCKER_API_VERSION`/`DOCKER_TLS_VERIFY` don't leak into the SSH-tunneled client
- `parsePlatform`: malformed input now returns an explicit error instead of silently dropping to "no platform constraint" and pulling the host-default architecture. Single-segment (`"linux"`), 4+-segment (`"linux/arm/v7/extra"`), and trailing-slash (`"linux/arm/"`) inputs are all rejected
- `LoadDockerAuthConfig`/`LoadDockerAuthConfigs`: `config.LoadDefaultConfigFile(nil)` panics on a malformed config file (it does `fmt.Fprintln` on the nil `io.Writer`). Switched to `config.Load(config.Dir())` so load errors reach the logger and the panic path is gone. Restored the old behaviour of returning `config.Load` and `GetAuthConfig` errors to the caller (the v29 refactor had silently downgraded them to warn-only). A `reference.ParseNormalizedNamed` failure on the image string falls through to the `docker.io` default rather than aborting, since the old string-based hostname extraction was infallible

Test assertions also updated for two upstream error-message string shifts (`go-connections` port-range parser; `cli/opts` envfile BOM check). Added unit-test coverage for the new `parsePlatform` helper, locking in the intentional limits (single-segment, 4+-segment, and trailing-slash platforms rejected).

---
This PR was written with the help of Claude Opus 4.7

Reviewed-on: https://gitea.com/gitea/runner/pulls/943
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-committed-by: silverwind <me@silverwind.io>

act/container/docker_images.go

@@ -10,8 +10,8 @@ import (
 	"context"
 	"fmt"
 
-	"github.com/docker/docker/api/types"
-	"github.com/docker/docker/client"
+	cerrdefs "github.com/containerd/errdefs"
+	"github.com/moby/moby/client"
 )
 
 // ImageExistsLocally returns a boolean indicating if an image with the
@@ -23,8 +23,8 @@ func ImageExistsLocally(ctx context.Context, imageName, platform string) (bool,
 	}
 	defer cli.Close()
 
-	inspectImage, _, err := cli.ImageInspectWithRaw(ctx, imageName)
-	if client.IsErrNotFound(err) {
+	inspectImage, err := cli.ImageInspect(ctx, imageName)
+	if cerrdefs.IsNotFound(err) {
 		return false, nil
 	} else if err != nil {
 		return false, err
@@ -46,14 +46,14 @@ func RemoveImage(ctx context.Context, imageName string, force, pruneChildren boo
 	}
 	defer cli.Close()
 
-	inspectImage, _, err := cli.ImageInspectWithRaw(ctx, imageName)
-	if client.IsErrNotFound(err) {
+	inspectImage, err := cli.ImageInspect(ctx, imageName)
+	if cerrdefs.IsNotFound(err) {
 		return false, nil
 	} else if err != nil {
 		return false, err
 	}
 
-	if _, err = cli.ImageRemove(ctx, inspectImage.ID, types.ImageRemoveOptions{
+	if _, err = cli.ImageRemove(ctx, inspectImage.ID, client.ImageRemoveOptions{
 		Force:         force,
 		PruneChildren: pruneChildren,
 	}); err != nil {