Add nanpa configuration

Use custom script to replace version in Podspec, README, and LiveKitSDK class

Author: ladvoc

.nanpa/.keep

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+Add changeset files in this directory.
+
+See nanpa documentation for more info:
+https://github.com/nbsp/nanpa/blob/trunk/doc/nanpa-changeset.5.scd

.nanparc

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+version 2.1.0
+name LiveKit
+custom ./scripts/replace_version.sh

scripts/replace_version.sh

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+#!/bin/sh
+# This script is invoked by nanpa with the new version set in VERSION.
+# ed is used instead of sed to make this script POSIX compliant (run on Mac or Linux runner).
+
+if [ -z "${VERSION}" ]; then
+    echo "Error: VERSION is not set. Exiting..."
+    exit 1
+fi
+
+replace() {
+    ed -s "$1" >/dev/null
+    if [ $? -ne 0 ]; then
+        echo "Error: unable to replace version in $1" >&2
+        exit 1
+    fi
+}
+
+# 1. Podspec version & tag
+# -----------------------------------------
+replace ./LiveKitClient.podspec <<EOF
+,s/spec.version = "[^"]*"/spec.version = "${VERSION}"/g
+,s/:tag => "[^"]*"/:tag => "${VERSION}"/g
+w
+q
+EOF
+
+# 2. README.md, installation guide
+# -----------------------------------------
+replace ./README.md <<EOF
+,s/upToNextMajor("[^"]*")/upToNextMajor("${VERSION}")/g
+w
+q
+EOF
+
+# 3. LiveKitSDK class, static version constant
+# -----------------------------------------
+replace ./Sources/LiveKit/LiveKit.swift <<EOF
+,s/static let version = "[^"]*"/static let version = "${VERSION}"/g
+w
+q
+EOF