Add XSREF_TABLES_PATH as environment variable

Author: steppi

.github/workflows/linux.yml

@@ -17,6 +17,8 @@ jobs:
   gcc_x86_64_linux:
     name: GCC X86_64 Linux
     runs-on: ubuntu-22.04
+    env:
+      XSREF_TABLES_PATH: "${{ github.workspace }}/xsref/tables"
 
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
@@ -49,7 +51,6 @@ jobs:
 
       - name: Install Catch2
         run: |
-          export XSREF_TABLES_PATH="./xsref/tables"
           cmake -Bbuild -H. -DBUILD_TESTING=OFF
           sudo cmake --build build/ --target install
         working-directory: ./Catch2