Support changing the PHP version (#75)

Author: swissspidy

.github/workflows/test-complex.yml

@@ -25,4 +25,5 @@ jobs:
           https://downloads.wordpress.org/plugin/wordpress-seo.zip
         iterations: 5
         repetitions: 1
-        wpVersion: 'trunk'
+        wp-version: 'trunk'
+        php-version: '7.4'

action.yml

@@ -32,6 +32,10 @@ inputs:
     required: false
     description: 'WordPress version to use.'
     default: 'latest'
+  php-version:
+    required: false
+    description: 'PHP version to use.'
+    default: 'auto'
   shard:
     required: false
     description: 'Shard to use if running tests in parallel in a matrix.'
@@ -146,13 +150,20 @@ runs:
           WP_VERSION="\"WordPress/WordPress#$WP_VERSION\""
         fi
 
+        if [[ $PHP_VERSION == 'auto' ]]; then
+          PHP_VERSION=null
+        else
+          PHP_VERSION="\"$PHP_VERSION\""
+        fi
+
         jq -n \
         --argjson wp "$WP_VERSION" \
+        --argjson php "$PHP_VERSION" \
         --arg rp "$REQUIRED_PLUGINS" \
         --arg p "$PLUGINS" \
         --arg t "$THEMES" \
         --arg rt "$REQUIRED_THEMES" \
-        '{core: $wp, plugins: [($rp | split("\n")), ($p | split("\n"))] | add, themes: [($rt | split("\n")), ($t | split("\n"))] | add}' \
+        '{core: $wp, phpVersion: $php, plugins: [($rp | split("\n")), ($p | split("\n"))] | add, themes: [($rt | split("\n")), ($t | split("\n"))] | add}' \
         > ${{ env.PERF_ACTION_PATH }}/env/.wp-env.override.json
         
         cat ${{ env.PERF_ACTION_PATH }}/env/.wp-env.override.json
@@ -161,6 +172,7 @@ runs:
         PLUGINS: ${{ inputs.plugins }}
         THEMES: ${{ inputs.themes }}
         WP_VERSION: ${{ inputs.wp-version }}
+        PHP_VERSION: ${{ inputs.php-version }}
       shell: 'bash'
 
     - name: Start WordPress