Add 3-attempt retry to npm/pnpm install step in plugin workflows (#132)

PRI-459: Adds 3-attempt retry wrapper (5s backoff) around the Install
dependencies step in plugin-ci.yaml and plugin-release.yaml to handle
transient npm/pnpm registry failures.

Co-authored-by: Chris Farhood <chris@farhood.org>

.github/workflows/plugin-ci.yaml

@@ -115,10 +115,24 @@ jobs:
 
       - name: Install dependencies
         run: |
-          if [ "${{ steps.pkg-manager.outputs.manager }}" = "pnpm" ]; then
-            pnpm install --frozen-lockfile
-          else
-            npm ci
+          max_attempts=3
+          attempt=1
+          while [ $attempt -le $max_attempts ]; do
+            echo "Attempt $attempt of $max_attempts"
+            if [ "${{ steps.pkg-manager.outputs.manager }}" = "pnpm" ]; then
+              pnpm install --frozen-lockfile && break
+            else
+              npm ci && break
+            fi
+            if [ $attempt -lt $max_attempts ]; then
+              echo "::warning::Install step failed on attempt $attempt. Retrying in 5 seconds..."
+              sleep 5
+            fi
+            attempt=$((attempt + 1))
+          done
+          if [ $attempt -gt $max_attempts ]; then
+            echo "::error::Install step failed after $max_attempts attempts."
+            exit 1
           fi
 
       - name: Build plugin
@@ -162,4 +176,4 @@ jobs:
             npx audit-ci --pnpm --audit-level=high
           else
             npx audit-ci --npm --audit-level=high
-          fi
+          fi

.github/workflows/plugin-release.yaml

@@ -226,10 +226,24 @@ jobs:
 
       - name: Install dependencies
         run: |
-          if [ "${{ steps.pkg-manager.outputs.manager }}" = "pnpm" ]; then
-            pnpm install --frozen-lockfile
-          else
-            npm ci
+          max_attempts=3
+          attempt=1
+          while [ $attempt -le $max_attempts ]; do
+            echo "Attempt $attempt of $max_attempts"
+            if [ "${{ steps.pkg-manager.outputs.manager }}" = "pnpm" ]; then
+              pnpm install --frozen-lockfile && break
+            else
+              npm ci && break
+            fi
+            if [ $attempt -lt $max_attempts ]; then
+              echo "::warning::Install step failed on attempt $attempt. Retrying in 5 seconds..."
+              sleep 5
+            fi
+            attempt=$((attempt + 1))
+          done
+          if [ $attempt -gt $max_attempts ]; then
+            echo "::error::Install step failed after $max_attempts attempts."
+            exit 1
           fi
 
       - name: Build plugin