Switch from Alpine+Musl to Debian Buster

Author: JakeWharton

.github/dependabot.yaml

@@ -10,3 +10,8 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
+
+  - package-ecosystem: "docker"
+    directory: "/"
+    schedule:
+      interval: "daily"

Dockerfile

@@ -1,5 +1,5 @@
 # Cross-compile the app for musl to create a statically-linked binary for alpine.
-FROM clux/muslrust:1.43.1-stable AS rust
+FROM rust:1.50 AS rust
 RUN rustup component add clippy rustfmt
 WORKDIR /app
 COPY Cargo.toml Cargo.lock .rustfmt.toml ./
@@ -21,7 +21,9 @@ RUN find . -type f | xargs shellcheck -e SC1008
 RUN shfmt -d .
 
 
-FROM oznu/s6-alpine:3.11
+FROM debian:buster-slim
+ADD https://github.com/just-containers/s6-overlay/releases/download/v2.2.0.1/s6-overlay-amd64-installer /tmp/
+RUN chmod +x /tmp/s6-overlay-amd64-installer && /tmp/s6-overlay-amd64-installer /
 ENV \
     # Fail if cont-init scripts exit with non-zero code.
     S6_BEHAVIOUR_IF_STAGE2_FAILS=2 \
@@ -33,9 +35,11 @@ ENV \
     PUID="" \
     PGID="" \
     GITOUT_ARGS=""
-RUN apk update && \
-    apk add ca-certificates curl && \
-    rm -rf /var/cache/apk/*
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        curl \
+      && \
+    rm -rf /var/lib/apt/lists/*
 COPY root/ /
 WORKDIR /app
-COPY --from=rust /app/target/x86_64-unknown-linux-musl/release/gitout ./
+COPY --from=rust /app/target/release/gitout ./