feat: support workflow ownership tags

[intel352]

Summary

• implements the workflow IaC ownership provider contract for DigitalOcean tag-backed resources
• maps owners to workflow-owner:<owner> DO tags for droplets, volumes, databases, and caches
• advertises IaCProviderOwnership in plugin manifests and bumps minEngineVersion to 0.69.1
• carries database/cache tags through read outputs so ownership reads are consistent

Verification

• GOWORK=off go test ./... -count=1
• GOWORK=off golangci-lint run ./internal/... ./cmd/... --new-from-rev origin/main
• git diff --check

TDD / regression proof

With implementation absent, the new tests failed to compile as expected:

internal/ownership_test.go:24:39: *DOProvider does not implement interfaces.OwnershipProvider (missing method GetOwner)
internal/ownership_test.go:61:18: p.GetOwner undefined
internal/ownership_test.go:85:11: p.SetOwner undefined
internal/ownership_test.go:122:19: p.ListOwners undefined

With the implementation restored, the focused tests pass:

ok github.com/GoCodeAlone/workflow-plugin-digitalocean/internal

Depends on merged workflow PR GoCodeAlone/workflow#824 (0072d3221).

[Copilot]

Pull request overview

This PR adds support for the workflow IaC ownership provider contract in the DigitalOcean plugin by representing ownership via workflow-owner:<owner> tags and exposing the new Ownership gRPC service/manifest capability.

Changes:

• Implement interfaces.OwnershipProvider on *DOProvider using DigitalOcean tags, plus a gRPC server adapter for the ownership RPCs.
• Advertise IaCProviderOwnership in both plugin manifests and bump minEngineVersion / workflow dependency to 0.69.1.
• Include database/cache tags in read outputs so ownership reads remain consistent across resource types.

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
plugin.json	Bumps minEngineVersion and advertises Ownership service in iacServices.
cmd/plugin/plugin.json	Mirrors manifest changes for the embedded/bundled plugin manifest.
internal/ownership.go	Adds ownership provider implementation (tag parsing/encoding, read/set/list).
internal/ownership_server.go	Adds gRPC handlers mapping pb Ownership RPCs to provider methods.
internal/ownership_test.go	Adds unit tests for provider behavior + service registration + manifest advertising.
internal/iacserver.go	Embeds UnimplementedIaCProviderOwnershipServer and asserts interface implementation.
internal/iacserver_mapper_test.go	Updates min engine version expectation to 0.69.1.
internal/drivers/database.go	Adds tags to database outputs in structpb-compatible form.
internal/drivers/cache.go	Adds tags to cache outputs in structpb-compatible form.
go.mod	Updates workflow dependency to 0.69.1-... prerelease.
go.sum	Updates dependency checksums for the workflow version bump.

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[Copilot]

Pull request overview

Copilot reviewed 10 out of 11 changed files in this pull request and generated 2 comments.