add secp256k1 build/install script

.github/workflows/go.yml

@@ -22,7 +22,7 @@ jobs:
         go-version: '1.23.1'
 
     - name: install secp256k1
-      run: cd p256k;bash install_secp256k1.sh
+      run: bash p256k/install_secp256k1.sh
 
     - name: Build
       run: go build -v ./...

p256k/install_libsecp256k1.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+SCRIPT_DIR=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
+sudo apt -y install build-essential autoconf libtool
+cd $SCRIPT_DIR
+rm -rf secp256k1
+git clone https://github.com/bitcoin-core/secp256k1.git
+cd secp256k1
+git checkout v0.6.0
+git submodule init
+git submodule update
+./autogen.sh
+./configure --enable-module-schnorrsig --prefix=/usr
+make -j1
+sudo make install