ci: emit the chain schema dump for local reconciliation work (#3275)

Reconciling the models against the deployed schema needs the actual
pg_dump, not an inference from the unified diff. Parsing table context
out of diff hunks drops every table whose CREATE TABLE line falls
outside a hunk — it under-reported 81 columns across 13 tables when the
real figure spans more, missing artist, gpu_job, download_event and
external_link entirely.

Same checksummed-base64 transport as the candidate baseline, for the
same reason: a plain cat of a file this size was silently truncated
mid-line by the runner on run 4964.

.forgejo/workflows/baseline.yml

@@ -107,6 +107,23 @@ jobs:
           docker exec "$PG_CONTAINER" pg_dump -U fabledcurator --schema-only \
             --no-owner --no-privileges -d fc_chain > chain.sql
           wc -l chain.sql
+          # Emit the dump itself, checksummed, for local analysis. Reconciling
+          # the models against the deployed schema (#3275) needs the ACTUAL
+          # schema, not an inference from a diff — parsing table context out of
+          # unified-diff hunks drops every table whose CREATE TABLE line falls
+          # outside a hunk, which silently under-reports.
+          #
+          # base64 + sha256 for the same reason as the candidate: a plain cat
+          # of a file this size was truncated mid-line by the runner with the
+          # step still green (run 4964).
+          set +x
+          B64=$(base64 -w 120 chain.sql)
+          echo "===== BEGIN CHAIN SCHEMA (base64) ====="
+          echo "$B64"
+          echo "===== END CHAIN SCHEMA ====="
+          echo "chain-sha256: $(sha256sum chain.sql | cut -d' ' -f1)"
+          echo "chain-bytes:  $(wc -c < chain.sql)"
+          set -x
 
       # A candidate baseline, autogenerated from the models against an EMPTY
       # database so every table shows up as a create. Printed for a human to