fix(Dockerfile): pnpm v11 build errors

- pnpm doesn't implicitly ignore post-install scripts anymore which means trying to build the docker image now fails. i've explicitly allowed them but idk could also ignore them maybe not sure what they actually do lol

- added `confirmModulesPurge: false` but not sure what it actually does as it's not documented? but either way it's also required for the `pnpm build` step to succeed non-interactively it seems idk weird stuff

- removed msmtp/sendmail while i was at it just like https://tangled.org/tranquil.farm/tranquil-pds/commit/f176f55862bc4c41472f8697cc2ca069c24d5e37

Dockerfile

@@ -1,7 +1,7 @@
 FROM node:24-alpine AS frontend
 RUN corepack enable && corepack prepare pnpm@latest --activate
 WORKDIR /app
-COPY frontend/package.json frontend/pnpm-lock.yaml ./
+COPY frontend/package.json frontend/pnpm-lock.yaml frontend/pnpm-workspace.yaml ./
 RUN pnpm install --frozen-lockfile
 COPY frontend/ ./
 RUN pnpm build
@@ -46,8 +46,7 @@ RUN --mount=type=cache,target=/usr/local/cargo/registry \
     cp target/release/tranquil-server /tmp/tranquil-pds
 
 FROM alpine:3.23
-RUN apk add --no-cache msmtp ca-certificates \
-    && ln -sf /usr/bin/msmtp /usr/sbin/sendmail
+RUN apk add --no-cache ca-certificates
 COPY --from=builder /tmp/tranquil-pds /usr/local/bin/tranquil-pds
 COPY --from=frontend /app/dist /var/lib/tranquil-pds/frontend
 WORKDIR /app

frontend/Dockerfile

@@ -1,7 +1,7 @@
 FROM node:24-alpine AS builder
 RUN corepack enable && corepack prepare pnpm@latest --activate
 WORKDIR /app
-COPY package.json pnpm-lock.yaml ./
+COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
 RUN pnpm install --frozen-lockfile
 COPY . ./
 RUN pnpm build

frontend/pnpm-lock.yaml

@@ -1311,7 +1311,6 @@ packages:
   whatwg-encoding@3.1.1:
     resolution: {integrity: sha512-6qN4hJdMwfYBtE3YBTTHhoeuUrDBPZmbQaxWAqSALV/MeEnR5z1xd8UKud2RAkFoPkmB+hli1TZSnyi84xz1vQ==}
     engines: {node: '>=18'}
-    deprecated: Use @exodus/bytes instead for a more spec-conformant and faster implementation
 
   whatwg-mimetype@4.0.0:
     resolution: {integrity: sha512-QaKxh0eNIi2mE9p2vEdzfagOKHCcj1pJ56EEHGQOVxp8r9/iszLUUV7v89x9O1p/T+NlTM5W7jW6+cz4Fq1YVg==}

frontend/pnpm-workspace.yaml

@@ -0,0 +1,4 @@
+confirmModulesPurge: false
+allowBuilds:
+  es5-ext: true
+  esbuild: true