chore(deps): upgrade Go to 1.26 (#5361)

Bump the main module, Dockerfile build stages, and devcontainer to Go
1.26.0. Plugin sub-modules under plugins/ remain on go 1.25 intentionally
(independent modules, untouched in this change).

Also add an explicit actions/setup-go@v6 step (with go-version-file:
go.mod) to the go-lint and go jobs in the CI pipeline. This matches the
golangci-lint-action v4+ requirement that setup-go run before the linter,
and pins the runner Go version to go.mod so CI does not depend on the
ubuntu-latest tools cache picking up Go 1.26.

.devcontainer/devcontainer.json

@@ -4,7 +4,7 @@
 		"dockerfile": "Dockerfile",
 		"args": {
 			// Update the VARIANT arg to pick a version of Go: 1, 1.15, 1.14
-			"VARIANT": "1.25",
+			"VARIANT": "1.26",
 			// Options
 			"INSTALL_NODE": "true",
 			"NODE_VERSION": "v24"

.github/workflows/pipeline.yml

@@ -64,6 +64,10 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
+      - uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v9
         with:
@@ -99,6 +103,10 @@ jobs:
       - name: Check out code into the Go module directory
         uses: actions/checkout@v6
 
+      - uses: actions/setup-go@v6
+        with:
+          go-version-file: go.mod
+
       - name: Download dependencies
         run: go mod download
 

Dockerfile

@@ -43,7 +43,7 @@ COPY --from=ui /build /build
 
 ########################################################################################################################
 ### Build Navidrome binary for Docker image (dynamic musl, enables native libwebp via dlopen)
-FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/golang:1.25-alpine AS build-alpine
+FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/golang:1.26-alpine AS build-alpine
 COPY --from=xx / /
 
 ARG TARGETPLATFORM
@@ -82,7 +82,7 @@ EOT
 
 ########################################################################################################################
 ### Build Navidrome binary for standalone distribution (static glibc, cross-compiled)
-FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/golang:1.25-trixie AS base
+FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/golang:1.26-trixie AS base
 RUN apt-get update && apt-get install -y clang lld
 COPY --from=xx / /
 WORKDIR /workspace

go.mod

@@ -1,6 +1,6 @@
 module github.com/navidrome/navidrome
 
-go 1.25.0
+go 1.26.0
 
 // Fork to implement raw tags support
 replace go.senan.xyz/taglib => github.com/deluan/go-taglib v0.0.0-20260407173416-cf47afbaa67a