Add first minial workflow

github/workflows/minimal.yml

@@ -0,0 +1,31 @@
+on:
+  push:
+    branches: [master]
+  pull_request:
+name: With dependencies at minimal versions
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+      - uses: actions/checkout@v2
+        with:
+          submodules: true
+      - name: cargo update -Zminimal-versions
+        uses: actions-rs/cargo@v1
+        with:
+          command: update
+          toolchain: nightly
+          args: -Zminimal-versions
+      - name: cargo test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+          args: --all-features --all-targets