Merge pull request #8 from PicturePipe/renovate/docker-alpine-3.x

Update alpine Docker tag to v3.13

Author: cybniv

Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.11@sha256:1861023544345fc0a4b2223f2bcbb0e903ff2c1f29c09141250baf7f81333b49 AS builder
+FROM alpine:3.13@sha256:d0710affa17fad5f466a70159cc458227bd25d4afb39514ef662ead3e6c99515 AS builder
 
 ENV GIT_CRYPT_VERSION 0.6.0
 ENV GIT_CRYPT_CHECKSUM 777c0c7aadbbc758b69aff1339ca61697011ef7b92f1d1ee9518a8ee7702bb78
@@ -17,7 +17,7 @@ RUN curl -fSsL https://github.com/AGWA/git-crypt/archive/$GIT_CRYPT_VERSION.tar.
     && make \
     && make install PREFIX=/usr
 
-FROM alpine:3.11@sha256:1861023544345fc0a4b2223f2bcbb0e903ff2c1f29c09141250baf7f81333b49
+FROM alpine:3.13@sha256:d0710affa17fad5f466a70159cc458227bd25d4afb39514ef662ead3e6c99515
 
 RUN apk --update --no-cache add \
     git \