ci: improve speeds

Dockerfile

@@ -50,41 +50,39 @@ FROM builder-base AS machete
 
 RUN cargo machete && touch machete-done
 
-FROM builder-base AS clippy
+FROM builder-base AS builder-ci
 
 RUN --mount=type=cache,target=${CARGO_HOME}/registry \
     --mount=type=cache,target=${CARGO_HOME}/git \
     --mount=type=cache,target=/app/target \
-    cargo clippy --workspace --benches --tests --examples --all-features --frozen -- -D warnings
-RUN touch clippy-done
+    cargo build && \
+    cargo nextest archive tests.zst
 
-FROM builder-base AS nextest
+
+FROM builder-ci AS ci-part
 
 RUN --mount=type=cache,target=${CARGO_HOME}/registry \
     --mount=type=cache,target=${CARGO_HOME}/git \
     --mount=type=cache,target=/app/target \
-    cargo nextest run --all-features --workspace --frozen
-RUN touch nextest-done
+        cargo clippy --workspace --benches --tests --examples --all-features --frozen -- -D warnings && \
+        cargo doc --all-features --workspace --frozen --no-deps && \
+        touch ci-part-done
 
-FROM builder-base AS fmt
+FROM builder-base AS nextest
 
-RUN cargo fmt --all -- --check && touch fmt-done
+COPY --from=builder-ci /app/tests.zst /app/tests.zst
+RUN cargo nextest run --archive-file tests.zst
 
-FROM builder-base AS docs
 
-RUN --mount=type=cache,target=${CARGO_HOME}/registry \
-    --mount=type=cache,target=${CARGO_HOME}/git \
-    --mount=type=cache,target=/app/target \
-    cargo doc --all-features --workspace --frozen --no-deps
-RUN touch docs-done
+FROM builder-base AS fmt
+
+RUN cargo fmt --all -- --check && touch fmt-done
 
 FROM builder-base AS ci
 
+COPY --from=ci-part /app/ci-part-done /app/ci-part-done
 COPY --from=machete /app/machete-done /app/machete-done
-COPY --from=clippy /app/clippy-done /app/clippy-done
-COPY --from=nextest /app/nextest-done /app/nextest-done
 COPY --from=fmt /app/fmt-done /app/fmt-done
-COPY --from=docs /app/docs-done /app/docs-done
 
 # Release builder
 FROM builder-base AS build-release