Feature: Use Gitea Actions to build automation_rs

Builds automation_rs and the corresponding docker image.
The binary is uploaded as an artifact and the image is uploaded to the
registry.

In order to improve caching the nightly version is locked using
rust-toolchain.toml

Dockerfile

@@ -1,64 +1,8 @@
-FROM rust:bookworm AS build
-
-# Create user
-ENV USER=automation
-ENV UID=10001
-RUN adduser \
-    --disabled-password \
-    --gecos "" \
-    --home "/nonexistent" \
-    --shell "/sbin/nologin" \
-    --no-create-home \
-    --uid "${UID}" \
-    "${USER}"
-
-# Create basic project structure
-RUN cargo new --bin /app
-RUN cargo new --lib /app/impl_cast && truncate -s 0 /app/impl_cast/src/lib.rs
-RUN cargo new --lib /app/google-home
-
-# Get the correct version of the compiler
-RUN rustup default nightly
-
-# Copy cargo config
-COPY .cargo/config.toml /app/.cargo/config.toml
-
-# Copy the Cargo.toml files
-COPY impl_cast/Cargo.toml /app/impl_cast
-COPY google-home/Cargo.toml /app/google-home
-COPY Cargo.toml Cargo.lock /app/
-
-# Download and build all the dependencies
-WORKDIR /app
-RUN --mount=type=cache,target=/usr/local/cargo/registry cargo build --release
-
-# Build impl_cast
-COPY impl_cast/src/ /app/impl_cast/src/
-RUN --mount=type=cache,target=/usr/local/cargo/registry set -e; touch /app/impl_cast/src/lib.rs; cargo build --release --package impl_cast
-
-# Build google-home
-COPY google-home/src/ /app/google-home/src/
-RUN --mount=type=cache,target=/usr/local/cargo/registry set -e; touch /app/google-home/src/lib.rs; cargo build --release --package google-home
-
-# Build automation
-COPY src/ /app/src/
-RUN --mount=type=cache,target=/usr/local/cargo/registry set -e; touch /app/src/main.rs /app/src/lib.rs /app/google-home/src/lib.rs /app/impl_cast/src/lib.rs; cargo build --release
-
-CMD ["/app/target/release/automation"]
-
-
-# FINAL IMAGE
-FROM gcr.io/distroless/cc-debian12:latest
-
-COPY --from=build /etc/passwd /etc/passwd
-COPY --from=build /etc/group /etc/group
+FROM gcr.io/distroless/cc-debian12:nonroot
 
 ENV AUTOMATION_CONFIG=/app/config.yml
-COPY config/config.yml /app/config.yml
+COPY ./config/config.yml /app/config.yml
 
-WORKDIR /app
-COPY --from=build /app/target/x86_64-unknown-linux-gnu/release/automation ./
-
-USER automation:automation
+COPY ./build/automation /app/automation
 
 CMD ["/app/automation"]