From ccdafdd3fac825f5f86f9f543b5cee3af92951e3 Mon Sep 17 00:00:00 2001
From: Benedikt Reinartz <filmor@gmail.com>
Date: Thu, 25 May 2023 07:52:11 +0200
Subject: [PATCH 1/4] Introduce CI cache

---
 .github/workflows/main.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9500dfc1..7281152d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -50,6 +50,8 @@ jobs:
         with:
           components: clippy
 
+      - uses: Swatinem/rust-cache@v2
+
       - run: cargo clippy --all-targets --all-features -- -D warnings
 
   test:
@@ -100,6 +102,8 @@ jobs:
         with:
           toolchain: ${{matrix.rust}}
 
+      - uses: Swatinem/rust-cache@v2
+
       - run: cargo test
 
       - name: Test rustler_mix

From 51747981c9dab77c9bd13746918f9edfbf98d1ab Mon Sep 17 00:00:00 2001
From: Benedikt Reinartz <filmor@gmail.com>
Date: Thu, 25 May 2023 08:03:49 +0200
Subject: [PATCH 2/4] Share key between Clippy and Test runs

---
 .github/workflows/main.yml | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7281152d..ec1153de 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -51,12 +51,15 @@ jobs:
           components: clippy
 
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+          shared-key: rustler
 
       - run: cargo clippy --all-targets --all-features -- -D warnings
 
   test:
     name: OTP ${{matrix.pair.erlang}} / Elixir ${{matrix.pair.elixir}} / Rust ${{matrix.rust}} / OS ${{matrix.os}}
-    needs: [format, clippy]
+    # needs: [format, clippy]
     strategy:
       matrix:
         pair:
@@ -103,6 +106,9 @@ jobs:
           toolchain: ${{matrix.rust}}
 
       - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+          shared-key: rustler
 
       - run: cargo test
 

From 7edbbd417a554409bd8fca4d800debfe240ff020 Mon Sep 17 00:00:00 2001
From: Benedikt Reinartz <filmor@gmail.com>
Date: Thu, 25 May 2023 08:15:22 +0200
Subject: [PATCH 3/4] Run explicit build step to fill the cache and use it in
 clippy/test

---
 .github/workflows/main.yml | 27 ++++++++++++++++++++++++---
 1 file changed, 24 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index ec1153de..bef5a66c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -37,9 +37,30 @@ jobs:
         working-directory: rustler_tests
         run: mix format --check-formatted
 
+  build:
+    name: Build ${{matrix.os}}
+    runs-on: ${{matrix.os}}-latest
+    strategy:
+      matrix:
+        os: [ubuntu, windows, macos]
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: clippy
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          cache-on-failure: true
+          shared-key: rustler
+
+      - run: cargo build
+
   clippy:
     name: Clippy ${{matrix.os}}
     runs-on: ${{matrix.os}}-latest
+    needs: [build]
     strategy:
       matrix:
         os: [ubuntu, windows, macos]
@@ -52,14 +73,14 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
         with:
-          cache-on-failure: true
           shared-key: rustler
+          save-if: false
 
       - run: cargo clippy --all-targets --all-features -- -D warnings
 
   test:
     name: OTP ${{matrix.pair.erlang}} / Elixir ${{matrix.pair.elixir}} / Rust ${{matrix.rust}} / OS ${{matrix.os}}
-    # needs: [format, clippy]
+    needs: [build]
     strategy:
       matrix:
         pair:
@@ -107,8 +128,8 @@ jobs:
 
       - uses: Swatinem/rust-cache@v2
         with:
-          cache-on-failure: true
           shared-key: rustler
+          save-if: false
 
       - run: cargo test
 

From 9c412d9a8c7700586db1678426fce2e0a0e069a9 Mon Sep 17 00:00:00 2001
From: Benedikt Reinartz <filmor@gmail.com>
Date: Thu, 25 May 2023 08:25:36 +0200
Subject: [PATCH 4/4] Also pre-build on nightly

---
 .github/workflows/main.yml | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index bef5a66c..0e8a70a9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -38,17 +38,18 @@ jobs:
         run: mix format --check-formatted
 
   build:
-    name: Build ${{matrix.os}}
+    name: Build ${{matrix.os}} ${{matrix.toolchain}}
     runs-on: ${{matrix.os}}-latest
     strategy:
       matrix:
         os: [ubuntu, windows, macos]
+        toolchain: [stable, nightly]
     steps:
       - uses: actions/checkout@v3
 
       - uses: dtolnay/rust-toolchain@stable
         with:
-          components: clippy
+          toolchain: ${{matrix.toolchain}}
 
       - uses: Swatinem/rust-cache@v2
         with: