Several CI tweaks

.github/workflows/UnitTests.yml

@@ -1,50 +1,49 @@
 name: Unit Tests
-
 on:
   pull_request:
-
   push:
     branches:
       - master
-
+permissions:
+  contents: read
 jobs:
   test-slurm:
+    runs-on: ${{ matrix.os }}
     timeout-minutes: 20
     strategy:
+      fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        julia_version: ["1.5", "nightly"]
-        julia_arch: [x64]
-      fail-fast: false
-
-    runs-on: ${{ matrix.os }}
-
+        julia_version:
+          - '1.2' # Oldest version of Julia that this package supports (according to Project.toml)
+          - '1.6' # Previous LTS
+          - '1.10' # Current LTS
+          - '1' # automatically expands to the latest stable 1.x release of Julia
+          - "nightly"
     env:
       SLURM: "latest"
-
     steps:
-    - name: Checkout
-      uses: actions/checkout@v4.2.2
-
-    - uses: julia-actions/setup-julia@latest
+    - uses: actions/checkout@v4.2.2
+      with:
+        persist-credentials: false
+    - uses: julia-actions/setup-julia@9b79636afcfb07ab02c256cede01fe2db6ba808c # v2.6.0
       with:
         arch: ${{ matrix.julia_arch }}
         version: ${{ matrix.julia_version }}
-
+    - name: Print Docker version
+      run: |
+        docker --version
+        docker version
     - name: Start Slurm Docker image
       run: |
         docker pull giovtorres/docker-centos7-slurm:$SLURM
         docker run -d -it -h ernie -v $(pwd):/SlurmTools -v $(julia -e 'print(dirname(Sys.BINDIR))'):/julia --name slurm-$SLURM giovtorres/docker-centos7-slurm:$SLURM
-
     - name: Instantiate package
       run: docker exec slurm-$SLURM /julia/bin/julia --project=/SlurmTools -e 'using Pkg; Pkg.instantiate(verbose=true); Pkg.build(verbose=true)'
-
     - name: Run tests without allocation
       run: docker exec slurm-$SLURM /julia/bin/julia --project=/SlurmTools -e 'using Pkg; Pkg.test(test_args=["slurm"])'
-
     - name: Run tests inside allocation
       run: docker exec slurm-$SLURM salloc -t 00:10:00 -n 2 /julia/bin/julia --project=/SlurmTools -e 'using Pkg; Pkg.test(test_args=["slurm"])'
-
     - name: Run tests inside sbatch
       run: |
          cat << EOF > sbatch.sh