roles/gitea: Install from upstream binary

I seem to have forgotten how I got the RPM for Gitea.  I think I built
it, but I cannot find the spec file, nor the RPM package.  Since this is
clearly not reproducible, I decided to switch to using the binary
provided by upstream for now, until either I or Fedora get around to
making a better RPM.

Installing Gitea from the upstream binary is simple: just download it
and copy it to `/usr/local/bin`.  Of course, the OS user and systemd
unit have to be managed by configuration policy when it's installed this
way.

roles/gitea/files/.gitignore

@@ -0,0 +1 @@
+gitea-*-linux-*

roles/gitea/files/gitea.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Gitea - Git with a cup of tea
+
+[Service]
+Type=simple
+User=gitea
+Environment=GITEA_CONFIG=/etc/gitea/app.ini
+Environment=HOME=/var/lib/gitea
+EnvironmentFile=-/etc/sysconfig/gitea
+ExecStart=/usr/local/bin/gitea web -c ${GITEA_CONFIG}
+
+[Install]
+WantedBy=multi-user.target