Optimize release workflow.

- Split Debian and Alpine into different build matrix
  This starts building both Debian and Alpine based images at the same time
- Make use of Docker BuildKit, which improves speed also.
- Use BuildKit caching for Rust Cargo across docker images.
  This prevents downloading the same crates multiple times.
- Use Github Actions Services to start a docker registry, starting it
via the build script sometimes caused issues.
- Updated the Build workflow to use Ubuntu 20.04 which is more close to
the Bullseye Debian release regarding package versions.

docker/armv7/Dockerfile.buildx.alpine

@@ -0,0 +1,125 @@
+# syntax=docker/dockerfile:1
+
+# This file was generated using a Jinja2 template.
+# Please make your changes in `Dockerfile.j2` and then `make` the individual Dockerfiles.
+
+# Using multistage build:
+# 	https://docs.docker.com/develop/develop-images/multistage-build/
+# 	https://whitfin.io/speeding-up-rust-docker-builds/
+####################### VAULT BUILD IMAGE  #######################
+# The web-vault digest specifies a particular web-vault build on Docker Hub.
+# Using the digest instead of the tag name provides better security,
+# as the digest of an image is immutable, whereas a tag name can later
+# be changed to point to a malicious image.
+#
+# To verify the current digest for a given tag name:
+# - From https://hub.docker.com/r/vaultwarden/web-vault/tags,
+#   click the tag name to view the digest of the image it currently points to.
+# - From the command line:
+#     $ docker pull vaultwarden/web-vault:v2.21.1
+#     $ docker image inspect --format "{{.RepoDigests}}" vaultwarden/web-vault:v2.21.1
+#     [vaultwarden/web-vault@sha256:29a4fa7bf3790fff9d908b02ac5a154913491f4bf30c95b87b06d8cf1c5516b5]
+#
+# - Conversely, to get the tag name from the digest:
+#     $ docker image inspect --format "{{.RepoTags}}" vaultwarden/web-vault@sha256:29a4fa7bf3790fff9d908b02ac5a154913491f4bf30c95b87b06d8cf1c5516b5
+#     [vaultwarden/web-vault:v2.21.1]
+#
+FROM vaultwarden/web-vault@sha256:29a4fa7bf3790fff9d908b02ac5a154913491f4bf30c95b87b06d8cf1c5516b5 as vault
+
+########################## BUILD IMAGE  ##########################
+FROM messense/rust-musl-cross:armv7-musleabihf as build
+
+# Alpine-based ARM (musl) only supports sqlite during compile time.
+# We now also need to add vendored_openssl, because the current base image we use to build has OpenSSL removed.
+ARG DB=sqlite,vendored_openssl
+
+# Build time options to avoid dpkg warnings and help with reproducible builds.
+ENV DEBIAN_FRONTEND=noninteractive \
+    LANG=C.UTF-8 \
+    TZ=UTC \
+    TERM=xterm-256color \
+    CARGO_HOME="/root/.cargo" \
+    USER="root"
+
+
+# Create CARGO_HOME folder and don't download rust docs
+RUN --mount=type=cache,target=/root/.cargo/git --mount=type=cache,target=/root/.cargo/registry mkdir -pv "${CARGO_HOME}" \
+    && rustup set profile minimal
+
+ENV RUSTFLAGS='-C link-arg=-s'
+ENV CFLAGS_armv7_unknown_linux_musleabihf="-mfpu=vfpv3-d16"
+
+# Creates a dummy project used to grab dependencies
+RUN USER=root cargo new --bin /app
+WORKDIR /app
+
+# Copies over *only* your manifests and build files
+COPY ./Cargo.* ./
+COPY ./rust-toolchain ./rust-toolchain
+COPY ./build.rs ./build.rs
+
+RUN --mount=type=cache,target=/root/.cargo/git --mount=type=cache,target=/root/.cargo/registry rustup target add armv7-unknown-linux-musleabihf
+
+# Builds your dependencies and removes the
+# dummy project, except the target folder
+# This folder contains the compiled dependencies
+RUN --mount=type=cache,target=/root/.cargo/git --mount=type=cache,target=/root/.cargo/registry cargo build --features ${DB} --release --target=armv7-unknown-linux-musleabihf \
+    && find . -not -path "./target*" -delete
+
+# Copies the complete project
+# To avoid copying unneeded files, use .dockerignore
+COPY . .
+
+# Make sure that we actually build the project
+RUN touch src/main.rs
+
+# Builds again, this time it'll just be
+# your actual source files being built
+RUN --mount=type=cache,target=/root/.cargo/git --mount=type=cache,target=/root/.cargo/registry cargo build --features ${DB} --release --target=armv7-unknown-linux-musleabihf
+# hadolint ignore=DL3059
+RUN musl-strip target/armv7-unknown-linux-musleabihf/release/vaultwarden
+
+######################## RUNTIME IMAGE  ########################
+# Create a new stage with a minimal image
+# because we already have a binary built
+FROM balenalib/armv7hf-alpine:3.14
+
+ENV ROCKET_ENV "staging"
+ENV ROCKET_PORT=80
+ENV ROCKET_WORKERS=10
+ENV SSL_CERT_DIR=/etc/ssl/certs
+
+# hadolint ignore=DL3059
+RUN [ "cross-build-start" ]
+
+# Create data folder and Install needed libraries
+RUN mkdir /data \
+    && apk add --no-cache \
+        openssl \
+        tzdata \
+        curl \
+        dumb-init \
+        ca-certificates
+
+# hadolint ignore=DL3059
+RUN [ "cross-build-end" ]
+
+VOLUME /data
+EXPOSE 80
+EXPOSE 3012
+
+# Copies the files from the context (Rocket.toml file and web-vault)
+# and the binary from the "build" stage to the current stage
+WORKDIR /
+COPY Rocket.toml .
+COPY --from=vault /web-vault ./web-vault
+COPY --from=build /app/target/armv7-unknown-linux-musleabihf/release/vaultwarden .
+
+COPY docker/healthcheck.sh /healthcheck.sh
+COPY docker/start.sh /start.sh
+
+HEALTHCHECK --interval=60s --timeout=10s CMD ["/healthcheck.sh"]
+
+# Configures the startup!
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+CMD ["/start.sh"]