tests: create seperate dry run for CPU and GPU mode

.github/workflows/snakemake-dry-run_cpu.yaml

@@ -0,0 +1,33 @@
+name: Snakemake dry run
+
+on:
+  push:
+    branches:
+     - develop
+     - main
+  pull_request:
+    branches:
+     - develop
+     - main
+  workflow_dispatch:
+
+jobs:
+  snakemake-dry-run:
+    name: Run snakemake dry run
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.9
+        uses: actions/setup-python@v3
+        with:
+          python-version: 3.9
+      - name: Install requirements.txt
+        run: |
+          pip install -r requirements.txt
+      - name: Install requirements.test.txt
+        run: |
+          pip install -r requirements.test.txt
+      - name: snakemake dry run
+        working-directory: .tests/integration
+        run: |
+          snakemake -n -s ../../workflow/Snakefile --configfile config/config.yaml --config aligner=bwa_cpu --config snp_caller=deepvariant_cpu