fix: bump Go base image to 1.26 in jvm/perf/ruby/dummy Dockerfiles (#73)

* fix: bump Go base image to 1.26 to satisfy go.mod requirement

go.mod was bumped to go 1.26.0 in PR #71's grouped module update, but four
Dockerfiles still pinned golang:1.24-bullseye (jvm, perf, ruby) or
golang:1.23.4-alpine (dummy), causing release.yml builds to fail with
'go.mod requires go >= 1.26.0 (running go 1.24.6)'.

Aligns all Go build stages on 1.26.

* ci: read Go version from go.mod in code-verify

setup-go was pinned to 1.23.4 but go.mod now requires 1.26.0; use
go-version-file so the workflow tracks go.mod automatically.

* fix: pin Go base image patch version to 1.26.3 (review feedback)

Per gemini-code-assist review on #73: use 1.26.3 patch pin instead of the
floating 1.26 tag, matching the alpine variants (bpf, python, jvm/alpine)
already on 1.26.3 and ensuring reproducible builds.

Author: mayankpande88

.github/workflows/code-verify.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: '1.23.4'
+          go-version-file: go.mod
 
       - name: Build
         run: go build -v ./...

docker/dummy/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.23.4-alpine AS agentbuild
+FROM golang:1.26.3-alpine AS agentbuild
 WORKDIR /go/src/github.com/nudgebee/application-profiler
 COPY . /go/src/github.com/nudgebee/application-profiler
 RUN go get -d -v ./...

docker/jvm/Dockerfile

@@ -1,5 +1,5 @@
 ARG JAVA_VERSION_TAG=21
-FROM golang:1.24.6-bullseye AS agentbuild
+FROM golang:1.26.3-bullseye AS agentbuild
 WORKDIR /go/src/github.com/nudgebee/application-profiler
 COPY . /go/src/github.com/nudgebee/application-profiler
 RUN go get -d -v ./...

docker/perf/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.24-bullseye AS agentbuild
+FROM golang:1.26.3-bullseye AS agentbuild
 WORKDIR /go/src/github.com/nudgebee/application-profiler
 COPY . /go/src/github.com/nudgebee/application-profiler
 RUN go get -d -v ./...

docker/ruby/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.24-bullseye AS agentbuild
+FROM golang:1.26.3-bullseye AS agentbuild
 WORKDIR /go/src/github.com/nudgebee/application-profiler
 COPY . /go/src/github.com/nudgebee/application-profiler
 RUN go get -d -v ./...