Cross-compile merlin on PowerPC

.github/workflows/main.yml

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+name: Test stacker
+
+on:
+  push:
+  pull_request:
+    types: [opened, repoened, synchronize]
+
+jobs:
+  native-test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        rust_toolchain: [nightly, stable]
+        os: [ubuntu-latest]
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust ${{ matrix.rust_toolchain }}
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: ${{ matrix.rust_toolchain }}
+            profile: minimal
+            default: true
+      - name: Build
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+      - name: Test
+        uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+  cross-linux-test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        rust_target:
+          - powerpc-unknown-linux-gnu
+          - powerpc64-unknown-linux-gnu
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Rust nightly
+        uses: actions-rs/toolchain@v1
+        with:
+            toolchain: nightly
+            profile: minimal
+            target: ${{ matrix.rust_target }}
+            default: true
+      - name: Build
+        uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: build
+          args: --target ${{ matrix.rust_target }}
+      - name: Test
+        uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: test
+          args: --target ${{ matrix.rust_target }} -- --test-threads=1
+      - name: Test Release
+        uses: actions-rs/cargo@v1
+        with:
+          use-cross: true
+          command: test
+          args: --target ${{ matrix.rust_target }} --release -- --test-threads=1