chore: clean up Dockerfile

Dockerfile

@@ -10,48 +10,16 @@ RUN go mod download
 RUN CGO_ENABLED=0 GOOS=linux go build -o /app/mysql-bkup
 
 FROM alpine:3.20.3
-ENV DB_HOST=""
-ENV DB_NAME=""
-ENV DB_USERNAME=""
-ENV DB_PASSWORD=""
-ENV DB_PORT=3306
-ENV STORAGE=local
-ENV AWS_S3_ENDPOINT=""
-ENV AWS_S3_BUCKET_NAME=""
-ENV AWS_ACCESS_KEY=""
-ENV AWS_SECRET_KEY=""
-ENV AWS_S3_PATH=""
-ENV AWS_REGION="us-west-2"
-ENV AWS_DISABLE_SSL="false"
-ENV AWS_FORCE_PATH_STYLE="true"
-ENV GPG_PASSPHRASE=""
-ENV SSH_USER=""
-ENV SSH_PASSWORD=""
-ENV SSH_HOST=""
-ENV SSH_IDENTIFY_FILE=""
-ENV SSH_PORT=22
-ENV REMOTE_PATH=""
-ENV FTP_HOST=""
-ENV FTP_PORT=21
-ENV FTP_USER=""
-ENV FTP_PASSWORD=""
-ENV TARGET_DB_HOST=""
-ENV TARGET_DB_PORT=3306
-ENV TARGET_DB_NAME=""
-ENV TARGET_DB_USERNAME=""
-ENV TARGET_DB_PASSWORD=""
-ENV BACKUP_CRON_EXPRESSION=""
-ENV TG_TOKEN=""
-ENV TG_CHAT_ID=""
 ENV TZ=UTC
 ARG WORKDIR="/config"
 ARG BACKUPDIR="/backup"
 ARG BACKUP_TMP_DIR="/tmp/backup"
 ARG TEMPLATES_DIR="/config/templates"
-ARG appVersion="v1.2.12"
+ARG appVersion=""
 ENV VERSION=${appVersion}
 LABEL author="Jonas Kaninda"
 LABEL version=${appVersion}
+LABEL github="github.com/jkaninda/mysql-bkup"
 
 RUN apk --update add --no-cache mysql-client mariadb-connector-c tzdata ca-certificates
 RUN mkdir $WORKDIR