Update go to 1.25 (#875)

Closes #872

* update go to 1.25

* update deprecated gomock

* remove deprecated ioutil

* update (and fix) ci

* add golang lint (as warning)

* enable formatters + freeze golang version

.github/workflows/ci.yaml

@@ -21,7 +21,6 @@ jobs:
   test-backend:
     name: Test Backend
     runs-on: ubuntu-latest
-    container: ghcr.io/packagrio/packagr:latest-golang
     # Service containers to run with `build` (Required for end-to-end testing)
     services:
       influxdb:
@@ -38,13 +37,10 @@ jobs:
     env:
       STATIC: true
     steps:
-      - name: Git
-        run: |
-          apt-get update && apt-get install -y software-properties-common
-          add-apt-repository ppa:git-core/ppa && apt-get update && apt-get install -y git
-          git --version
+      - name: Add influxdb to hosts
+        run: echo "127.0.0.1 influxdb" | sudo tee -a /etc/hosts
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v6
       - name: Test Backend
         run: |
           make binary-clean binary-test-coverage
@@ -102,7 +98,7 @@ jobs:
         uses: actions/checkout@v2
       - uses: actions/setup-go@v3
         with:
-          go-version: '^1.20.1'
+          go-version: '^1.25'
       - name: Build Binaries
         run: |
           make binary-clean binary-all

.github/workflows/golang-lint.yml

@@ -0,0 +1,21 @@
+name: golangci-lint
+on:
+  push:
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  golangci:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-go@v6
+        with:
+          go-version: 1.25
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v9
+        with:
+          args: --issues-exit-code=0

.github/workflows/release.yaml

@@ -97,7 +97,7 @@ jobs:
           name: workspace
       - uses: actions/setup-go@v6
         with:
-          go-version: '1.20.1' # The Go version to download (if necessary) and use.
+          go-version: '1.25' # The Go version to download (if necessary) and use.
       - name: Build Binaries
         run: |
           make binary-clean binary-all