use date +%Y in config.env for dynamic footer year

Author: SusanGithaigaN

client/src/views/footer.js

@@ -46,22 +46,8 @@ export default ({ t, page }) =>
           { process.env.TERMS && <span><a href={ process.env.TERMS } target="_blank">Terms &amp; </a></span> }
           { process.env.PRIVACY && <span><a href={ process.env.PRIVACY } target="_blank">Privacy</a></span> }
           </div>
-          {
-            (() => {
-                let raw = process.env.SITE_FOOTER || t`Powered by esplora`
-                const year = String(new Date().getFullYear())
-                // if a year already exists in the footer text, replace it with the current year
-                if (/\b\d{4}\b/.test(raw)) {
-                  return raw.replace(/\b\d{4}\b/, year)
-                }
-                // if the footer text starts with ©, insert the current year right after it
-                if (raw.match(/^©/i)) {
-                  return raw.replace(/^©\s*/i, `© ${year} `)
-                }
-                // otherwise, just stick the current year at the front
-                return `${year} ${raw}`
-            })()
-          }</div>
+          <div>{ process.env.SITE_FOOTER || t`Powered by esplora` }</div>
         </div>
       </div>
-  </footer>
+    </div>
+  </footer>

flavors/blockstream/config.env

@@ -1,5 +1,5 @@
 export SITE_DESC='Blockstream Explorer is an open source block explorer providing detailed blockchain data across Bitcoin, Testnet, and Liquid. Supports Tor and tracking-free.'
-export SITE_FOOTER='© Blockstream Corporation Inc. All rights reserved.'
+export SITE_FOOTER="© $(date +%Y) Blockstream Corporation Inc. All rights reserved."
 export HEAD_HTML=\
 '<meta property="og:image" content="https://blockstream.info/img/social-sharing.png">'\
 '<meta name="twitter:image" content="https://blockstream.info/img/social-sharing.png">'\