added bowtie index test github workflow

.github/workflows/bowtie_index.yml

@@ -0,0 +1,36 @@
+name: bowtie_index
+on:
+    push:
+        paths:
+            - software/bowtie/index/**
+            - .github/workflows/bowtie_index.yml
+            - tests/software/bowtie/**
+    pull_request:
+        paths:
+            - software/bowtie/index/**
+            - .github/workflows/bowtie_index.yml
+            - tests/software/bowtie/**
+
+jobs:
+    ci_test:
+        runs-on: ubuntu-latest
+        env:
+            NXF_ANSI_LOG: false
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Install Nextflow
+              run: |
+                  export NXF_VER="20.07.1"
+                  wget -qO- get.nextflow.io | bash
+                  sudo mv nextflow /usr/local/bin/
+
+            - name: Set up Python
+              uses: actions/setup-python@v2
+              with:
+                  python-version: "3.x"
+            - name: Install dependencies
+              run: python -m pip install --upgrade pip pytest-workflow
+
+            # Test the module
+            - run: pytest --tag bowtie_index --symlink --wt 2