anubis: repin the image ref to the lowercase ghcr path

podman's reference parser rejects mixed-case repository refs before any
network I/O ('repository name must be uppercase'); upstream's own install
docs pull lowercase (ghcr resolves case-insensitively). The first deploy
of this chain exit-2'd on that parse error — the image was not yet
pulled, so the guarded vhosts 502 until this deploy lands.

tests/anubis.bats

@@ -23,7 +23,7 @@ setup() {
 }
 
 @test "the image is pinned to an exact upstream tag and never pulled at boot" {
-    grep -qE '^Image=ghcr\.io/TecharoHQ/anubis:v[0-9]+\.[0-9]+\.[0-9]+$' "$UNIT"
+    grep -qE '^Image=ghcr\.io/techaroq/anubis:v[0-9]+\.[0-9]+\.[0-9]+$' "$UNIT"
     grep -q '^Pull=never$' "$UNIT"
 }