Fixes: arm crossbuild commandline err, env-file, readme

Signed-off-by: Terekhin Alexandr <alex@bearns.me>

Dockerfile

@@ -5,12 +5,12 @@ RUN apk add --no-cache openssl-dev linux-headers zlib-dev gcc gperf cmake build-
 	&& mkdir build \
 	&& cd build \
 	&&	cmake -DCMAKE_BUILD_TYPE=Release .. \
-	&& cmake --build . --target install \
+	&& cmake --build . -j 4 --target install \
 	&& apk del linux-headers gcc gperf cmake build-base git \
 	&& rm -r ./telegram-bot-api
 RUN adduser --no-create-home --uid 2000 --disabled-password tg-bot \
 	&& mkdir -p /opt/telegram-bot-api \
-	&& chown tg-bot:tg-bot /opt/telegram-bot-api
+	&& chown tg-bot /opt/telegram-bot-api
 
 ENV TELEGRAM_API_ID=""
 ENV TELEGRAM_API_HASH=""

README.md

@@ -16,7 +16,7 @@ Put it into `tg-bot-api.env` file variables.
 Just run `./build.sh` script
 Or build manualy: `docker build -t <you image name> .`
 And run it: 
-    `docker run -p <host port>:8081 --name <you container name> --env=./tg-bot-api.env <you image name>`
+    `docker run -p <host port>:8081 --name <you container name> --env-file=./tg-bot-api.env <you image name>`
 
 ## Crossbuild
 
@@ -49,5 +49,8 @@ default             docker
 Set used by default
 `docker buildx use <gallant_mahavira>`
 
-Run crossbuild
+Run crossbuild & export image to tar file
-`docker buildx build -t <you image name> --platform linux/arm/v7 .`
+`docker buildx build -o "type=docker,dest=image.docker.tar" -t <you image name> --platform linux/arm/v7 .`
+
+Import crossbuilded image into target host
+`docker image load -i image.docker.tar`

build.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 docker build -t bearns.me/tg-api .
 docker container rm tg-api
-docker run --name tg-api --env=./tg-bot-api.env -p 8081:8081 bearns.me/tg-api
+docker run --name tg-api --env-file=./tg-bot-api.env -p 8081:8081 bearns.me/tg-api