[release/v1.28.x] Cache maven local (#489)

* Cache maven local

* cache maven local at PR build time

* Update caching steps

* Only cache patch outputs

Author: bryan-aguilar

.github/workflows/main-build.yml

@@ -60,6 +60,14 @@ jobs:
         with:
           java-version: 17
           distribution: temurin
+          
+        # cache local patch outputs
+      - name: Cache local Maven repository
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.m2/repository/io/opentelemetry/
+          key: ${{ runner.os }}-maven-local-${{ hashFiles('.github/patches/**/opentelemetry-java-*.patch') }}
 
       - name: Publish patched dependencies to maven local
         uses: ./.github/actions/patch-dependencies
@@ -308,6 +316,14 @@ jobs:
           java-version: 17
           distribution: temurin
 
+        # cache local patch outputs
+      - name: Cache local Maven repository
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.m2/repository/io/opentelemetry/
+          key: ${{ runner.os }}-maven-local-${{ hashFiles('.github/patches/**/opentelemetry-java-*.patch') }}
+          
       - uses: gradle/wrapper-validation-action@v1
 
       - name: Configure AWS Credentials

.github/workflows/pr-build.yml

@@ -25,6 +25,14 @@ jobs:
         with:
           node-version: 16
 
+        # cache local patch outputs
+      - name: Cache local Maven repository
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.m2/repository/io/opentelemetry/
+          key: ${{ runner.os }}-maven-local-${{ hashFiles('.github/patches/**/opentelemetry-java-*.patch') }}
+
       # vaadin tests use pnpm
       - name: Cache pnpm modules
         uses: actions/cache@v3
@@ -65,6 +73,14 @@ jobs:
           java-version: 17
           distribution: temurin
 
+        # cache local patch outputs
+      - name: Cache local Maven repository
+        uses: actions/cache@v3
+        with:
+          path: |
+            ~/.m2/repository/io/opentelemetry/
+          key: ${{ runner.os }}-maven-local-${{ hashFiles('.github/patches/**/opentelemetry-java-*.patch') }}
+
       - uses: gradle/wrapper-validation-action@v1
 
       - name: Publish patched dependencies to maven local