fix(ci): pin fedora:39 for dnf4, fix test paths for debian/alpine

- Fedora 40+ ships dnf5 (not 41 as assumed) — pin to 39
- Debian container: /usr/bin/bash doesn't exist, use /usr/bin/dpkg
- Alpine: use busybox for LatestVersion test (always available)

.github/workflows/integration.yml

@@ -55,7 +55,7 @@ jobs:
   fedora:
     name: Fedora (dnf)
     runs-on: ubuntu-latest
-    container: fedora:41  # pin to dnf4; dnf5 (fedora 42+) has different output format
+    container: fedora:39  # last release with dnf4; dnf5 (fedora 40+) needs separate parser
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5

apk/apk_integration_test.go

@@ -83,7 +83,7 @@ func TestIntegration_Apk(t *testing.T) {
 
 	t.Run("Capabilities", func(t *testing.T) {
 		if vq, ok := mgr.(snack.VersionQuerier); ok {
-			ver, err := vq.LatestVersion(ctx, "tree")
+			ver, err := vq.LatestVersion(ctx, "busybox")
 			require.NoError(t, err)
 			assert.NotEmpty(t, ver)
 

dpkg/dpkg_integration_test.go

@@ -53,7 +53,7 @@ func TestIntegration_Dpkg(t *testing.T) {
 
 	t.Run("FileOwner", func(t *testing.T) {
 		if fo, ok := mgr.(snack.FileOwner); ok {
-			owner, err := fo.Owner(ctx, "/usr/bin/bash")
+			owner, err := fo.Owner(ctx, "/usr/bin/dpkg")
 			require.NoError(t, err)
 			assert.NotEmpty(t, owner)