Implement cache in CI

.github/workflows/main.yml

@@ -10,13 +10,13 @@ on:
 
 jobs:
   build:
-    name: Test on OTP ${{ matrix.tuple.otp_version }} and ${{ matrix.tuple.os }}
-    runs-on: ${{ matrix.tuple.os }}
+    name: Test on OTP ${{ matrix.otp_version }} and ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
 
     strategy:
       fail-fast: false
       matrix:
-        tuple:
+        include:
           - otp_version: 25
             os: ubuntu-22.04
             rebar3_version: 3.22
@@ -25,18 +25,39 @@ jobs:
             rebar3_version: 3.22
           - otp_version: 23
             os: ubuntu-20.04
-            rebar3_version: 3.15
+            rebar3_version: 3.18
           - otp_version: 22
             os: ubuntu-20.04
-            rebar3_version: 3.15
+            rebar3_version: 3.18
 
     steps:
     - uses: actions/checkout@v4
 
     - uses: erlef/setup-beam@v1
+      id: setup-beam
       with:
-        otp-version: ${{ matrix.tuple.otp_version }}
-        rebar3-version: ${{ matrix.tuple.rebar3_version }}
+        otp-version: ${{ matrix.otp_version }}
+        rebar3-version: ${{ matrix.rebar3_version }}
+
+    - name: Restore _build
+      uses: actions/cache@v3
+      with:
+        path: _build
+        key: "_build-cache-for\
+              -os-${{ matrix.os }}\
+              -otp-${{ steps.setup-beam.outputs.otp-version }}\
+              -rebar3-${{ steps.setup-beam.outputs.rebar3-version }}\
+              -hash-${{ hashFiles('rebar.lock') }}"
+
+    - name: Restore rebar3's cache
+      uses: actions/cache@v3
+      with:
+        path: ~/.cache/rebar3
+        key: "rebar3-cache-for\
+              -os-${{ matrix.os }}\
+              -otp-${{ steps.setup-beam.outputs.otp-version }}\
+              -rebar3-${{ steps.setup-beam.outputs.rebar3-version }}\
+              -hash-${{ hashFiles('rebar.lock') }}"
 
     - name: Compile
       run: rebar3 compile