Add dockerfile, fix linux build

Dockerfile

@@ -0,0 +1,46 @@
+# We need to use the Rust build image, because
+# we need the Rust compile and Cargo tooling
+FROM clux/muslrust:stable as build
+
+# Install cmake as it is not included in muslrust, but is needed by libssh2-sys
+RUN apt-get update && apt-get install -y \
+  cmake \
+  --no-install-recommends && \
+  rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+# Creates a dummy project used to grab dependencies
+RUN USER=root cargo init --bin
+
+# Copies over *only* your manifests
+COPY ./Cargo.* ./
+
+# Builds your dependencies and removes the
+# fake source code from the dummy project
+RUN cargo build --release
+RUN rm src/*.rs
+RUN rm target/x86_64-unknown-linux-musl/release/oktaws
+
+# Copies only your actual source code to
+# avoid invalidating the cache at all
+COPY ./src ./src
+
+# Builds again, this time it'll just be
+# your actual source files being built
+RUN cargo build --release
+
+FROM alpine:latest as certs
+RUN apk --update add ca-certificates
+
+# Create a new stage with a minimal image
+# because we already have a binary built
+FROM alpine:latest
+
+# Copies standard SSL certs from the "build" stage
+COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+
+# Copies the binary from the "build" stage
+COPY --from=build /app/target/x86_64-unknown-linux-musl/release/oktaws /bin/
+
+# Configures the startup!
+ENTRYPOINT ["/bin/oktaws"]

src/config/credentials.rs

@@ -73,5 +73,5 @@ pub fn save_credentials(
 
     Keyring::new(&format!("oktaws::okta::{}", organization.name), username)
         .set_password(password)
-        .map_err(|e| e.into())
+        .map_err(|e| format_err!("{}", e))
 }