[CI] Set TMPDIR for the entire job

While `DUMP_MLIR_DIR` is more specific, it doesn't work if Reactant itself can't
be precompiled and we want to exfiltrate a module dumped at that time.

Author: giordano

.github/workflows/CI-localjll.yml

@@ -36,8 +36,13 @@ jobs:
         exclude:
           - os: macOS-latest
             version: '1.10'
+    env:
+      TMPDIR: ${{ github.workspace }}/tmp
     steps:
       - uses: actions/checkout@v4
+      - name: Create TMPDIR
+        run: |
+          mkdir -p ${{ env.TMPDIR }}
       - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}

.github/workflows/CI.yml

@@ -86,8 +86,13 @@ jobs:
           #   libReactant: packaged
           #   version: '1.10'
           #   test_group: integration
+    env:
+      TMPDIR: ${{ github.workspace }}/tmp
     steps:
       - uses: actions/checkout@v4
+      - name: Create TMPDIR
+        run: |
+          mkdir -p ${{ env.TMPDIR }}
       - uses: julia-actions/setup-julia@v2
         if: ${{ ! matrix.assertions }}
         with:

.github/workflows/downgrade.yml

@@ -41,8 +41,13 @@ jobs:
         runtime:
           - PJRT
           - IFRT
+    env:
+      TMPDIR: ${{ github.workspace }}/tmp
     steps:
       - uses: actions/checkout@v4
+      - name: Create TMPDIR
+        run: |
+          mkdir -p ${{ env.TMPDIR }}
       - uses: julia-actions/setup-julia@v2
         with:
           version: "1.10"

test/runtests.jl

@@ -1,11 +1,5 @@
 using Reactant, SafeTestsets, Test
 
-# If we are in GitHub Actions, make `TMPDIR` be a local directory from which we
-# can upload artifacts at the end.
-if get(ENV, "GITHUB_ACTIONS", "false") == "true"
-    Reactant.MLIR.IR.DUMP_MLIR_DIR[] = mkpath(joinpath(@__DIR__, "..", "mlir_modules"))
-end
-
 # parse some command-line arguments
 function extract_flag!(args, flag, default=nothing; typ=typeof(default))
     for f in args