Fix CI: bump builder to golang:1.26 and modernize test workflow

The gitea SDK requires go >= 1.26. The test workflow was still on
go 1.14/1.15 and could not build the module.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: kurtmc

.github/workflows/test.yml

@@ -2,20 +2,15 @@ on: [push, pull_request]
 name: Test
 jobs:
   test:
-    strategy:
-      matrix:
-        go-version: [1.14.x, 1.15.x]
-        os: [ubuntu-latest, macos-latest]
-    runs-on: ${{ matrix.os }}
+    runs-on: ubuntu-latest
     steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
     - name: Install Go
-      uses: actions/setup-go@v2
+      uses: actions/setup-go@v5
       with:
-        go-version: ${{ matrix.go-version }}
-    - name: Checkout code
-      uses: actions/checkout@v2
+        go-version-file: go.mod
     - name: Install Task
       run: curl -sL https://taskfile.dev/install.sh | sh
     - name: Run CI Task
       run: ./bin/task ci
-

Dockerfile

@@ -13,7 +13,7 @@ ADD scripts/install_git_crypt.sh install_git_crypt.sh
 RUN ./install_git_crypt.sh && rm ./install_git_crypt.sh
 RUN rm -rf scripts
 
-FROM golang:1.25 as builder
+FROM golang:1.26 as builder
 WORKDIR /go/src/github.com/telia-oss/github-pr-resource
 ENV GOOS=$GOOS
 ENV GOARCH=$GOARCH