Add support for connect-go v2 (#2775)

Adds support for the connect-go v2 plugins

---------

Signed-off-by: Edward McFarlane <emcfarlane@buf.build>

Author: emcfarlane

plugins/connectrpc/go/v2.0.0/.dockerignore

@@ -0,0 +1,2 @@
+*
+!Dockerfile

plugins/connectrpc/go/v2.0.0/Dockerfile

@@ -0,0 +1,15 @@
+# syntax=docker/dockerfile:1.26
+FROM --platform=$BUILDPLATFORM golang:1.27.1-trixie@sha256:9baa6b4187bbb98d240372a8a235ac0bb6b5ddd52bba1431dc2f7c0705862728 AS build
+
+ARG TARGETOS TARGETARCH
+ENV CGO_ENABLED=0 GOOS=$TARGETOS GOARCH=$TARGETARCH
+
+RUN --mount=type=cache,target=/go/pkg/mod \
+    go install -ldflags="-s -w" -trimpath connectrpc.com/connect/v2/cmd/protoc-gen-connect-go@v2.0.0 \
+ && mv /go/bin/${GOOS}_${GOARCH}/protoc-gen-connect-go /go/bin/protoc-gen-connect-go || true
+
+FROM scratch
+COPY --from=build --link --chown=root:root /etc/passwd /etc/passwd
+COPY --from=build --link /go/bin/protoc-gen-connect-go /
+USER nobody
+ENTRYPOINT [ "/protoc-gen-connect-go" ]

plugins/connectrpc/go/v2.0.0/buf.plugin.yaml

@@ -0,0 +1,20 @@
+version: v1
+name: buf.build/connectrpc/go
+plugin_version: v2.0.0
+source_url: https://github.com/connectrpc/connect-go
+integration_guide_url: https://connectrpc.com/docs/go/getting-started
+description: Generates client and server stubs for connectrpc.com/connect/v2. Compatible with the gRPC, gRPC-Web, and Connect RPC protocols.
+deps:
+  - plugin: buf.build/protocolbuffers/go:v1.36.12
+output_languages:
+  - go
+registry:
+  go:
+    min_version: "1.26"
+    deps:
+      - module: connectrpc.com/connect/v2
+        version: v2.0.0
+  opts:
+    - paths=source_relative
+spdx_license_id: Apache-2.0
+license_url: https://github.com/connectrpc/connect-go/blob/v2.0.0/LICENSE

plugins/connectrpc/gosimple/source.yaml

@@ -2,3 +2,5 @@ source:
   github:
     owner: connectrpc
     repository: connect-go
+  # connect-go v2 generates the simple API by default, use connectrpc/go for v2
+  max_version: 2.0.0

tests/testdata/buf.build/connectrpc/go/v2.0.0/eliza/plugin.sum

@@ -0,0 +1 @@
+h1:lnbX0OY51EFKxFR5XrteI33vHCs5FO9HjtWecqzIbUQ=

tests/testdata/buf.build/connectrpc/go/v2.0.0/petapis/plugin.sum

@@ -0,0 +1 @@
+h1:8Ond+l+jysrMHFNlJg47NUOj4lLeW/C1HSMbms71s2Y=