Allow to add custom tags (#24)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

src/meta.ts

@@ -33,7 +33,7 @@ export class Meta {
 
   private getVersion(): Version {
     const currentDate = this.date;
-    const version: Version = {
+    let version: Version = {
       main: undefined,
       partial: [],
       latest: false
@@ -91,6 +91,18 @@ export class Meta {
       version.main = `pr-${this.context.ref.replace(/^refs\/pull\//g, '').replace(/\/merge$/g, '')}`;
     }
 
+    if (this.inputs.tagCustom.length > 0) {
+      if (this.inputs.tagCustomOnly) {
+        version = {
+          main: this.inputs.tagCustom.shift(),
+          partial: this.inputs.tagCustom,
+          latest: false
+        };
+      } else {
+        version.partial.push(...this.inputs.tagCustom);
+      }
+    }
+
     version.partial = version.partial.filter((item, index) => version.partial.indexOf(item) === index);
     return version;
   }