Add share cards

ckpool/Dockerfile

@@ -2,7 +2,7 @@
 # CKPool-solo build stage
 # ============================================================================
 # Builds a patched ckpool binary from upstream source at a pinned commit.
-# Binaries land in /build/ckpool/src/ — we copy `ckpool` and `ckpmsg` into
+# Binaries land in /build/ckpool/src/, we copy `ckpool` and `ckpmsg` into
 # the runtime image. We do NOT `make install` because upstream's
 # install-exec-hook calls setcap which fails inside a docker build.
 #