Add LibreTLS-3.8.1

LibreTLS/3.8.1/Dockerfile

@@ -0,0 +1,17 @@
+FROM alpine
+RUN apk update && apk add \
+	make \
+	gcc \
+	musl-dev \
+	wget
+COPY --from=libopenssl:3.1.1-minimal /opt/spm/openssl-3.1.1/ /usr/local/
+RUN wget https://causal.agency/libretls/libretls-3.8.1.tar.gz
+RUN tar -xf libretls-3.8.1.tar.gz
+WORKDIR /libretls-3.8.1
+ARG PREFIX=/opt/spm/libretls-3.8.1
+RUN ./configure \
+    --prefix=$PREFIX \
+    --enable-shared=no \
+    CFLAGS='-ffunction-sections -fdata-sections -Os'
+RUN make -j$(nproc --all)
+RUN make install