Run unit tests in gha (facebookresearch#24)

Summary:
As title

Pull Request resolved: facebookresearch#24

Test Plan: successful run on this PR itself (https://github.com/facebookresearch/multimodal/runs/6016844312?check_suite_focus=true)

Reviewed By: langong347

Differential Revision: D35633892

Pulled By: ankitade

fbshipit-source-id: e6616d59622d6a870e693c655db38f1f2cbf2660

.github/workflows/unit_test.yaml

@@ -1 +1,32 @@
 name: unit test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+
+jobs:
+  unit_tests:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repo
+        uses: actions/checkout@v2
+      - name: Setup conda env
+        uses: conda-incubator/setup-miniconda@v2
+        with:
+          miniconda-version: "latest"
+          activate-environment: test
+          python-version: "3.8"
+      - name: Install dependencies
+        shell: bash -l {0}
+        run: |
+          set -eux
+          conda activate test
+          conda install pytorch torchvision torchtext cpuonly -c pytorch-nightly
+          pip install -e ".[dev]"
+      - name: Run unit tests
+        shell: bash -l {0}
+        run: |
+          set -eux
+          conda activate test
+          pytest test -vv

requirements.txt

@@ -1 +1,2 @@
 packaging
+iopath