fix: ensure data paths are set correctly in docker, fixes #958 (#959)

Dockerfile.distroless

@@ -40,13 +40,16 @@ COPY ./cmd ./cmd
 COPY ./internal ./internal
 COPY --from=frontend-builder /frontend/dist ./internal/assets/dist
 
-RUN mkdir -p data
-
 RUN CGO_ENABLED=0 go build -ldflags "${LDFLAGS} \
     -X github.com/tinyauthapp/tinyauth/internal/model.Version=${VERSION} \
     -X github.com/tinyauthapp/tinyauth/internal/model.CommitHash=${COMMIT_HASH} \
     -X github.com/tinyauthapp/tinyauth/internal/model.BuildTimestamp=${BUILD_TIMESTAMP}" ./cmd/tinyauth
 
+# Make the data directory with a non-root user
+RUN addgroup tinyauth && adduser -DH tinyauth -G tinyauth
+RUN mkdir -p /data/resources /data/oidc /data/tailscale
+RUN chown -R tinyauth:tinyauth /data
+
 # Runner
 FROM gcr.io/distroless/static-debian12:latest AS runner
 
@@ -55,15 +58,14 @@ WORKDIR /tinyauth
 COPY --from=builder /tinyauth/tinyauth ./
 
 # Since it's distroless, we need to copy the data directory from the builder stage
-COPY --from=builder /tinyauth/data /data
+COPY --from=builder /data /data
 
 EXPOSE 3000
 
 VOLUME ["/data"]
 
-ENV TINYAUTH_DATABASE_PATH=/data/tinyauth.db
-
-ENV TINYAUTH_RESOURCES_PATH=/data/resources
+# Tell tinyauth that it's running in a container and where to find the data directory
+ENV RUNTIME_ENV=docker
 
 ENV PATH=$PATH:/tinyauth