feat: display castopod version in admin footer

add CP_VERSION constant in app/Config/Constants.php that updates upon release through
prepare-release.sh script

closes #68

.releaserc.json

@@ -19,6 +19,7 @@
       "@semantic-release/git",
       {
         "assets": [
+          "app/Config/Constants.php",
           "composer.json",
           "package.json",
           "package-lock.json",

app/Config/Constants.php

 <?php
 
+//--------------------------------------------------------------------------
+// Castopod Version
+//--------------------------------------------------------------------------
+// The Castopod version number to display.
+//
+// NOTE: this constant is updated upon release with Continuous Integration.
+//
+defined('CP_VERSION') || define('CP_VERSION', '1.0.0-alpha.8');
+
 //--------------------------------------------------------------------
 // App Namespace
 //--------------------------------------------------------------------

app/Views/admin/_layout.php

@@ -41,10 +41,11 @@
         </div>
     </main>
     <footer class="px-2 py-2 mx-auto text-xs text-right holy-grail-footer">
-        <small><?= lang('Common.powered_by', [
+        <?= lang('Common.powered_by', [
             'castopod' =>
-                '<a class="underline hover:no-underline" href="https://castopod.org/" target="_blank" rel="noreferrer noopener">Castopod</a>',
-        ]) ?></small>
+                '<a class="underline hover:no-underline" href="https://castopod.org/" target="_blank" rel="noreferrer noopener">Castopod</a> v' .
+                CP_VERSION,
+        ]) ?>
     </footer>
     <button
         type="button"

prepare-release.sh

@@ -6,6 +6,9 @@ COMPOSER_VERSION=$(echo "$VERSION" | perl -pe 's/(?<=[alpha|beta])\.//g')
 # replace composer.json version using jq
 echo "$( jq '.version = "'$COMPOSER_VERSION'"' composer.json )" > composer.json
 
+# replace CP_VERSION constant in app/config/constants
+sed -i "s/^defined('CP_VERSION').*/defined('CP_VERSION') || define('CP_VERSION', '$VERSION');/" ./app/Config/Constants.php
+
 # download GeoLite2-City archive and extract it to writable/uploads
 wget -c "https://download.maxmind.com/app/geoip_download?edition_id=GeoLite2-City&license_key=v3PguJMcmZMb9Ld0&suffix=tar.gz" -O - | tar -xz -C ./writable/uploads/