ci: drop Go 1.18 from CI matrix

Remove 1.18.x from the test matrix and the associated
"Set PACKAGES env" step that filtered modules based on
their minimum Go version. All modules now require a Go
version covered by oldstable/stable.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

Author: tonistiigi

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
   test:
     strategy:
       matrix:
-        go-version: [1.18.x, oldstable, stable]
+        go-version: [oldstable, stable]
         platform: [ubuntu-22.04, ubuntu-24.04, windows-2022, windows-2025, macos-15, macos-26]
     runs-on: ${{ matrix.platform }}
     timeout-minutes: 10 # guardrails timeout for the whole job
@@ -44,24 +44,6 @@ jobs:
         # We don't need to run golangci-lint here yet, but
         # there's no way to avoid it, so run it on one module.
         working-directory: ./mountinfo
-    - name: Set PACKAGES env
-      if: ${{ matrix.go-version == '1.18.x' }}
-      run: |
-        # Check if the module supports this version of Go.
-        go_version="$(go env GOVERSION)"
-        go_version="${go_version#go}"
-        
-        packages=""
-        for p in */; do
-          [ -f "$p/go.mod" ] || continue
-          if ! (cd "$p" && go list -m -f "{{if gt .GoVersion \"$go_version\"}}ko{{end}}" | grep -q ko); then
-            packages+="${p%/} "
-          else
-            echo "::notice::SKIP: github.com/moby/sys/${p%/} requires a more recent version of Go"
-          fi
-        done
-        
-        echo "PACKAGES=${packages}" >> "$GITHUB_ENV"
     - name: go mod tidy
       run: |
         make foreach CMD="go mod tidy"