fix archive test job

Author: sebsto

.github/workflows/integration_tests.yml

@@ -41,11 +41,6 @@ on:
         # Note: we don't use Amazon Linux 2 here because zip is not installed by default.
         description: "Container image for the matrix test jobs. Defaults to Swift 6.2 on Amazon Linux 2."
         default: "swift:6.2-amazonlinux2"
-      archive_linux_swift_container_image:
-        type: string
-        # Note: we don't use Amazon Linux 2 here because zip is not installed by default.
-        description: "Container image for the plugin test job. Defaults to Swift 6.2 on Ubuntu."
-        default: "swift:6.2-noble"
 
 ## We are cancelling previously triggered workflow runs
 concurrency:
@@ -111,11 +106,7 @@ jobs:
       fail-fast: false
       matrix:
         examples: ${{ fromJson(inputs.archive_plugin_examples) }}
-        # We are using only one Swift version
-        swift:
-          - image: ${{ inputs.archive_linux_swift_container_image }}
-    container:
-      image: ${{ matrix.swift.image }}
+    # These must run on Ubuntu and not in a container, because the plugin uses docker
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4

Examples/HelloWorld/Package.swift

@@ -1,4 +1,9 @@
-// swift-tools-version:6.2
+// swift-tools-version:6.1
+// This example has to be in Swift 6.1 because it is used in the test archive plugin CI job
+// That job runs on GitHub's ubuntu-latest environment that only supports Swift 6.1
+// https://github.com/actions/runner-images?tab=readme-ov-file
+// https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md
+// We can update to Swift 6.2 when GitHUb hosts will have Swift 6.2
 
 import PackageDescription
 

Examples/ResourcesPackaging/Package.swift

@@ -1,5 +1,9 @@
-// swift-tools-version: 6.2
-// The swift-tools-version declares the minimum version of Swift required to build this package.
+// swift-tools-version:6.1
+// This example has to be in Swift 6.1 because it is used in the test archive plugin CI job
+// That job runs on GitHub's ubuntu-latest environment that only supports Swift 6.1
+// https://github.com/actions/runner-images?tab=readme-ov-file
+// https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2404-Readme.md
+// We can update to Swift 6.2 when GitHUb hosts will have Swift 6.2
 
 import PackageDescription