Fixing arm build, adding autoupdate gitea workflow

README.md

@@ -5,6 +5,8 @@ x86_64 tarball:
 
 `https://packages.element.io/desktop/install/linux/glibc-x86-64/element-desktop.tar.gz`
 
+Latest upstream version tracked in this repo: `1.12.15`
+
 ## What it does
 
 - Downloads the current upstream tarball.
@@ -12,6 +14,8 @@ x86_64 tarball:
 - Repackages the prebuilt binaries into an RPM.
 - Removes the upstream auto-update manifest so RPM remains the update path.
 - Sets `resources/package-type` to `rpm`.
+- Forces `rpmbuild` to target `x86_64`, which avoids COPR SRPM failures on
+  non-`x86_64` source builders.
 - Supports COPR SCM builds through `.copr/Makefile`.
 
 ## Local builds
@@ -37,6 +41,7 @@ Use COPR's SCM source type with:
 - Clone URL: this repository
 - Spec file: `SPECS/element-desktop.spec`
 - SRPM build method: `make srpm`
+- Enable only `x86_64` binary chroots for this package
 
 COPR will invoke `.copr/Makefile`, which calls the same SRPM generation script
 used for local builds. That script downloads the upstream tarball during the