docker: bake espeak-ng data for Piper TTS

espeak-rs-sys installs espeak-ng-data into the build tree and compiles that
path in as the default, so the runtime image failed with 'phontab: No such
file or directory'. Copy the data from the builder to /usr/share and point
PIPER_ESPEAKNG_DATA_DIRECTORY there; compose overrides the host path from
.env.

Also trim trailing slashes from Copyparty base URLs, document that env_file
changes need --force-recreate, and clean inline comments in .env.example.

1 files changed, 8 insertions, 0 deletions

diff --git a/Dockerfile b/Dockerfile
index eaedc7f..891768a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -33,6 +33,11 @@ RUN mkdir src \
 COPY src ./src
 RUN cargo build --release
 
+# espeak-rs-sys installs the espeak-ng data into the build directory and
+# compiles that path in as the default. Without this the runtime image has no
+# data files and TTS fails with "phontab: No such file or directory".
+RUN cp -a target/release/build/espeak-rs-sys-*/out/share/espeak-ng-data /app/espeak-ng-data
+
 # ── Runtime ───────────────────────────────────────────────────────────
 FROM debian:trixie-slim
 
@@ -65,11 +70,14 @@ RUN useradd --create-home --uid 1000 --shell /usr/sbin/nologin bot \
 
 WORKDIR /app
 COPY --from=builder /app/target/release/senator-sperma /usr/local/bin/senator-sperma
+# espeak looks for <PIPER_ESPEAKNG_DATA_DIRECTORY>/espeak-ng-data.
+COPY --from=builder /app/espeak-ng-data /usr/share/espeak-ng-data
 
 USER bot
 
 ENV TZ=Europe/Warsaw \
     TTS_MODEL_PATH=/app/piper \
+    PIPER_ESPEAKNG_DATA_DIRECTORY=/usr/share \
     RUST_LOG=info \
     HOME=/home/bot