CI: Use a script to get the latest version of baton. (#16)

.github/workflows/ci.yaml

@@ -66,7 +66,7 @@ jobs:
       #     PGPASSWORD: secretpassword 
       #   run: psql -h localhost --user postgres -f test/ci.sql
       - name: Install baton
-        run: wget https://github.com/ConductorOne/baton/releases/download/v0.1.2/baton-v0.1.2-linux-amd64.tar.gz && tar xzf baton-v0.1.2-linux-amd64.tar.gz && mv baton /usr/local/bin
+        run: ./scripts/get-baton.sh && mv baton /usr/local/bin
       - name: Build baton-postgresql
         run: go build ./cmd/baton-postgresql
       - name: Run baton-postgresql

scripts/get-baton.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+
+set -euxo pipefail
+
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+ARCH=$(uname -m)
+if [ "${ARCH}" = "x86_64" ]; then
+  ARCH="amd64"
+fi
+
+RELEASES_URL="https://api.github.com/repos/conductorone/baton/releases/latest"
+BASE_URL="https://github.com/conductorone/baton/releases/download"
+
+DOWNLOAD_URL=$(curl "${RELEASES_URL}" | jq --raw-output ".assets[].browser_download_url | match(\"${BASE_URL}/v[.0-9]+/baton-v[.0-9]+-${OS}-${ARCH}.*\"; \"i\").string")
+
+FILENAME=$(basename ${DOWNLOAD_URL})
+
+curl -LO ${DOWNLOAD_URL}
+tar xzf ${FILENAME}