move release script

Putting it in the top level can cause confusion.
Resolves #69

.github/workflows/release.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+# This is used to build cross platform linux binaries for a release in CI.
+# Since this is not supervised, abort if anything does not work.
+set -e
+
+# Cross-compiling needs a linker for the respective platforms. If you are on a Debian-based x86_64 Linux,
+# you can install them with:
+sudo apt -y install podman gcc-arm-linux-gnueabihf gcc-aarch64-linux-gnu
+# Also install cross compilation tool for cargo
+cargo install cross
+
+for i in x86_64-unknown-linux-gnu aarch64-unknown-linux-gnu arm-unknown-linux-gnueabihf armv7-unknown-linux-gnueabihf
+do
+	cross build --verbose --release --target $i
+	cp target/$i/release/agate agate.$i
+done
+
+# Strip all the binaries.
+strip agate.x86_64-unknown-linux-gnu
+aarch64-linux-gnu-strip agate.aarch64-unknown-linux-gnu
+arm-linux-gnueabihf-strip agate.arm-unknown-linux-gnueabihf agate.armv7-unknown-linux-gnueabihf
+
+# compress the binaries.
+gzip agate.*

.github/workflows/release.yml

@@ -30,7 +30,7 @@ jobs:
     steps:
     - uses: actions/checkout@v1
     - name: build
-      run: bash release.sh
+      run: bash .github/workflows/release.sh
     - name: upload release asset x86_64
       uses: actions/upload-release-asset@v1
       env: