fix: resolve GITHUB_OUTPUT format error and suppress telemetry warning

- Fix grep -c pattern that caused "Invalid format '0'" error when no
  matches found. grep -c exits with code 1 on zero matches, causing
  the || fallback to run and produce multiline output "0\n0"
- Add DISABLE_TELEMETRY=true env var to suppress telemetry warning in CI

Author: james00012

.github/workflows/nuke-account.yml

@@ -61,6 +61,8 @@ jobs:
       - run: go mod download
       - name: Nuke global resources
         id: nuke
+        env:
+          DISABLE_TELEMETRY: true
         run: |
           set +e
           go run -ldflags="-X 'main.VERSION=${{ github.sha }}'" main.go aws \
@@ -69,8 +71,8 @@ jobs:
             --delete-unaliased-kms-keys --log-level info 2>&1 | tee /tmp/nuke-global.log
           EXIT_CODE=${PIPESTATUS[0]}
 
-          DELETED=$(grep -c "\[Deleted\]" /tmp/nuke-global.log || echo "0")
-          ERRORS=$(grep -c "\[Failed\]" /tmp/nuke-global.log || echo "0")
+          DELETED=$(grep -c "\[Deleted\]" /tmp/nuke-global.log 2>/dev/null) || DELETED=0
+          ERRORS=$(grep -c "\[Failed\]" /tmp/nuke-global.log 2>/dev/null) || ERRORS=0
           echo "deleted_count=${DELETED}" >> $GITHUB_OUTPUT
           echo "error_count=${ERRORS}" >> $GITHUB_OUTPUT
 
@@ -131,6 +133,8 @@ jobs:
       - run: go mod download
       - name: Nuke ${{ matrix.region }}
         id: nuke
+        env:
+          DISABLE_TELEMETRY: true
         run: |
           set +e
           go run -ldflags="-X 'main.VERSION=${{ github.sha }}'" main.go aws \
@@ -139,8 +143,8 @@ jobs:
             --delete-unaliased-kms-keys --log-level info 2>&1 | tee /tmp/nuke-${{ matrix.region }}.log
           EXIT_CODE=${PIPESTATUS[0]}
 
-          DELETED=$(grep -c "\[Deleted\]" /tmp/nuke-${{ matrix.region }}.log || echo "0")
-          ERRORS=$(grep -c "\[Failed\]" /tmp/nuke-${{ matrix.region }}.log || echo "0")
+          DELETED=$(grep -c "\[Deleted\]" /tmp/nuke-${{ matrix.region }}.log 2>/dev/null) || DELETED=0
+          ERRORS=$(grep -c "\[Failed\]" /tmp/nuke-${{ matrix.region }}.log 2>/dev/null) || ERRORS=0
           echo "deleted_count=${DELETED}" >> $GITHUB_OUTPUT
           echo "error_count=${ERRORS}" >> $GITHUB_OUTPUT