fix: make schema idempotent with IF NOT EXISTS

Add i18n locale files to Docker image and fix all CREATE
statements to use IF NOT EXISTS to survive container restarts.

Dockerfile

@@ -20,6 +20,7 @@ WORKDIR /data
 
 COPY --from=builder /usr/local/bin/worktime-bot /usr/local/bin/worktime-bot
 COPY --from=builder /src/db/schema.sql ./db/schema.sql
+COPY --from=builder /src/pkg/i18n/ ./i18n/
 
 VOLUME ["/data"]
 

db/schema.sql

@@ -1,4 +1,4 @@
-CREATE TABLE events (
+CREATE TABLE IF NOT EXISTS events (
     id INTEGER PRIMARY KEY,
     event_type TEXT NOT NULL
         CHECK (event_type IN ('in', 'out')),
@@ -9,7 +9,7 @@ CREATE TABLE events (
           DEFAULT (unixepoch())
 );
 
-CREATE INDEX idx_events_occurred_at
+CREATE INDEX IF NOT EXISTS idx_events_occurred_at
 ON events(occurred_at);
 
 CREATE TABLE IF NOT EXISTS settings (
@@ -17,7 +17,7 @@ CREATE TABLE IF NOT EXISTS settings (
     value TEXT NOT NULL DEFAULT ''
 );
 
-CREATE TABLE days_off (
+CREATE TABLE IF NOT EXISTS days_off (
     date TEXT PRIMARY KEY
           CHECK (date = strftime('%Y-%m-%d', date)),
     reason TEXT NOT NULL DEFAULT '',