workflow: Add integration tests, bump go and ubuntu

Setup Bats and run integration tests with them after build.

Bump go compiler to version 1.25.

Remove ubuntu 20.04 (no longer available on github).

Author: kolayne

.github/workflows/build_and_maybe_release.yml

@@ -8,13 +8,13 @@ jobs:
   build:
     env:
       RELEASE_OS: ubuntu-24.04
-      RELEASE_GOVER: "1.22"
+      RELEASE_GOVER: "1.25"
 
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-24.04, ubuntu-22.04, ubuntu-20.04 ]
-        gover: [ "1.22", "1.21", "1.20" ]
+        os: [ ubuntu-24.04, ubuntu-22.04 ]
+        gover: [ "1.25", "1.24", "1.23", "1.22", "1.21", "1.20" ]
 
     runs-on: ${{ matrix.os }}
 
@@ -23,8 +23,17 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version: ${{ matrix.gover }}
+      - name: Setup Bats
+        uses: bats-core/[email protected]
       - name: Build the project
         run: go build .
+      - name: Run integration tests
+        env:
+          # For `bats -F pretty`
+          TERM: xterm-256color
+        run: |
+          sudo -b ./docker-on-top
+          bats -F pretty tests/
       - name: Save built binary
         if: startsWith(github.ref, 'refs/tags/') && matrix.os == env.RELEASE_OS && matrix.gover == env.RELEASE_GOVER
         uses: actions/upload-artifact@v4