Switch testing from CircleCI to GitHub Actions

.github/config.yml

@@ -5,11 +5,11 @@ newPRWelcomeComment: >
   Thanks for opening this pull request!
   We have detected this is the first time you have contributed
   to *NiMARE*.
-  Please check out our [contributing guidelines](https://github.com/neurostuff/NiMARE/blob/master/CONTRIBUTING.md).
+  Please check out our [contributing guidelines](https://github.com/neurostuff/NiMARE/blob/main/CONTRIBUTING.md).
 
   We invite you to list yourself as a *NiMARE* contributor, so if your name
   is not already mentioned, please modify the
-  [``.zenodo.json``](https://github.com/neurostuff/NiMARE/blob/master/.zenodo.json)
+  [``.zenodo.json``](https://github.com/neurostuff/NiMARE/blob/main/.zenodo.json)
   file with your data right above Angie's entry. Example:
 
   ```

.github/pull_request_template.md

@@ -6,7 +6,7 @@ If there is other information that would be helpful to include, please don't hes
 
 Please also label your pull request with the relevant tags.
 See here for more information and a list of available options:
-https://github.com/neurostuff/NiMARE/blob/master/CONTRIBUTING.md#pull-requests
+https://github.com/neurostuff/NiMARE/blob/main/CONTRIBUTING.md#pull-requests
 -->
 
 <!-- Please indicate after the # which issue you're closing with this PR.

.github/workflows/linting.yml

@@ -0,0 +1,55 @@
+name: "Lint Code"
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+    branches:
+      - '*'
+
+concurrency:
+  group: environment-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  # Determine if tests should be run based on commit message.
+  check_skip:
+    runs-on: ubuntu-latest
+    outputs:
+      skip: ${{ steps.result_step.outputs.ci-skip }}
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+      - id: result_step
+        uses: mstachniuk/ci-skip@master
+        with:
+          commit-filter: '[skip ci];[ci skip];[skip github]'
+          commit-filter-separator: ';'
+
+  style_check:
+    needs: check_skip
+    if: ${{ needs.check_skip.outputs.skip == 'false' }}
+    runs-on: "ubuntu-latest"
+    strategy:
+        fail-fast: false
+        matrix:
+            os: ["ubuntu-latest"]
+            python-version: ["3.7"]
+    name: Style check
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v2
+      - name: 'Set up python'
+        uses: actions/setup-python@v2
+        with:
+            python-version: ${{ matrix.python-version }}
+      - name: 'Install NiMARE'
+        shell: bash {0}
+        run: pip install -e .[tests]
+      - name: 'Run linter'
+        shell: bash {0}
+        run: make lint