use Action inputs

.github/actions/install-swift/action.yml

@@ -1,5 +1,13 @@
 runs:
   using: composite
+  inputs:
+    swift-dir:
+      description: The directory name part of the distribution URL
+      required: true
+    swift-version:
+      description: Git tag indicating the Swift version
+      required: true
+
   steps:
     # https://www.swift.org/install/linux/#installation-via-tarball
     - name: Install dependent packages for Swift
@@ -27,10 +35,10 @@ runs:
     
     - name: Download Swift
       shell: bash
-      run: curl -fLO https://download.swift.org/${{ env.SWIFT_DIR }}/${{ env.SWIFT_VERSION }}/${{ env.SWIFT_VERSION }}-ubuntu22.04.tar.gz
+      run: curl -fLO https://download.swift.org/${{ inputs.swift-dir }}/${{ inputs.swift-version }}/${{ inputs.swift-version }}-ubuntu22.04.tar.gz
       working-directory: ${{ env.RUNNER_TEMP }}
 
     - name: Unarchive and Install Swift
       shell: bash
-      run: sudo tar -xf ${{ env.SWIFT_VERSION }}-ubuntu22.04.tar.gz --strip-components=2 -C /usr/local
+      run: sudo tar -xf ${{ inputs.swift-version }}-ubuntu22.04.tar.gz --strip-components=2 -C /usr/local
       working-directory: ${{ env.RUNNER_TEMP }}

.github/workflows/swift.yml

@@ -45,9 +45,6 @@ jobs:
     name: Build and test on Linux with Swift ${{ matrix.swift.version }}
     timeout-minutes: 40
     runs-on: ubuntu-22.04
-    env:
-      SWIFT_DIR: ${{ matrix.swift.dir }}
-      SWIFT_VERSION: ${{ matrix.swift.version }}
     strategy:
       matrix:
         include:
@@ -59,6 +56,9 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: ./.github/actions/install-swift
+        with:
+          swift-dir: ${{ matrix.swift.dir }}
+          swift-version: ${{ matrix.swift.version }}
 
       - name: Install dependent packages for Wasm
         run: >