start putting together a dockerfile

is still missing font installation plus potentially more stuff

Dockerfile

@@ -0,0 +1,58 @@
+FROM alpine AS builder
+
+RUN apk add --no-cache cargo
+
+RUN mkdir /src
+COPY . /src
+WORKDIR /src
+
+RUN cargo build --release --no-default-features
+
+# ##############################################
+
+FROM alpine
+
+ARG ffmpeg_ver=7.0
+
+RUN apk add --no-cache \
+		dav1d fontconfig freetype harfbuzz librsvg libva lilv-libs opus svt-av1 x264-libs x265 \
+		inkscape libgcc \
+ && apk add --no-cache --virtual .build-deps \
+		build-base \
+		dav1d-dev fontconfig-dev freetype-dev harfbuzz-dev librsvg-dev libva-dev lilv-dev opus-dev svt-av1-dev x264-dev x265-dev \
+ && wget -q https://ffmpeg.org/releases/ffmpeg-${ffmpeg_ver}.tar.bz2 \
+ && tar xfa ffmpeg-${ffmpeg_ver}.tar.bz2 \
+ && cd ffmpeg-${ffmpeg_ver} \
+ && ./configure \
+		--prefix=/usr/local \
+		--disable-asm \
+		--disable-librtmp \
+		--disable-lzma \
+		--disable-static \
+		--enable-avfilter \
+		--enable-gpl \
+		--enable-libdav1d \
+		--enable-libfontconfig \
+		--enable-libfreetype \
+		--enable-libharfbuzz \
+		--enable-libopus \
+		--enable-librsvg \
+		--enable-libsvtav1 \
+		--enable-libx264 \
+		--enable-libx265 \
+		--enable-lto=auto \
+		--enable-lv2 \
+		--enable-pic \
+		--enable-postproc \
+		--enable-pthreads \
+		--enable-shared \
+		--enable-vaapi \
+		--enable-version3 \
+		--optflags="-O3" \
+ && make -j$(nproc) install \
+ && apk del --no-cache .build-deps \
+ && cd .. \
+ && rm -r ffmpeg-${ffmpeg_ver} ffmpeg-${ffmpeg_ver}.tar.bz2
+COPY --from=builder /src/target/release/render_video /usr/local/bin/render_video
+
+ENTRYPOINT ["/usr/local/bin/render_video"]

src/iotro.rs

@@ -94,6 +94,12 @@ pub const BRITISH: Language<'static> = Language {
 	questions_feedback: "Questions, Suggestions and Feedback"
 };
 
+impl Default for Language<'static> {
+	fn default() -> Self {
+		GERMAN
+	}
+}
+
 impl FromStr for Language<'static> {
 	type Err = anyhow::Error;
 

src/main.rs

@@ -154,6 +154,7 @@ struct ProjectLecture {
 	docent: String,
 	#[serde_as(as = "DisplayFromStr")]
 	date: Date,
+	#[serde(default = "Default::default")]
 	#[serde_as(as = "DisplayFromStr")]
 	lang: Language<'static>
 }