Remove --frozen-lockfile from examples (#171)

When a project has both npm and pnpm, using pnpm/action-setup will result in an error: `Multiple versions of pnpm specified`.

The previous implementation was only meant to avoid the "ERR_PNPM_BAD_PM_VERSION" error, but it did not take into account the situation of multiple different package managers.

Signed-off-by: Kevin Cui <bh@bugs.cc>

README.md

@@ -40,7 +40,7 @@ If `run_install` is a YAML string representation of either an object or an array
 
 #### `run_install.args`
 
-**Optional** (_type:_ `string[]`) Additional arguments after `pnpm [recursive] install`, e.g. `[--frozen-lockfile, --strict-peer-dependencies]`.
+**Optional** (_type:_ `string[]`) Additional arguments after `pnpm [recursive] install`, e.g. `[--ignore-scripts, --strict-peer-dependencies]`.
 
 ### `package_json_file`
 
@@ -117,9 +117,9 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: 10
-          run_install: |
+          run_install:
             - recursive: true
-              args: [--frozen-lockfile, --strict-peer-dependencies]
+              args: [--strict-peer-dependencies]
             - args: [--global, gulp, prettier, typescript]
 ```
 

src/install-pnpm/run.ts

@@ -64,6 +64,7 @@ async function readTarget(opts: {
   if (version) {
     if (
       typeof packageManager === 'string' &&
+      packageManager.startsWith('pnpm@') &&
       packageManager.replace('pnpm@', '') !== version
     ) {
       throw new Error(`Multiple versions of pnpm specified: