pmd into Workflow (#882)

Co-authored-by: Spencer Bryngelson <shb@gatech.edu>

Author: Malmahrouqi3

.github/workflows/pmd.yml

@@ -0,0 +1,36 @@
+name: Source DRYness
+
+on: [push, pull_request, workflow_dispatch]
+
+jobs:    
+  pmd:
+      name: PMD
+      runs-on: "ubuntu-latest"
+      env:
+          pr_everything: 0
+      steps:
+          - name: Clone - PR
+            uses: actions/checkout@v4
+
+          - name: Set up Java
+            uses: actions/setup-java@v4
+            with:
+              distribution: temurin
+              java-version: '17'
+
+          - name: Run CPD for Fortran
+            continue-on-error: true
+            run: |
+              # Get latest PMD version from GitHub API
+              PMD_VERSION=$(curl -s https://api.github.com/repos/pmd/pmd/releases/latest | grep '"tag_name":' | cut -d'"' -f4 | sed 's/pmd_releases\///')
+              echo "Using PMD version: $PMD_VERSION"
+
+              curl -sSL -o pmd.zip \
+                "https://github.com/pmd/pmd/releases/download/pmd_releases/${PMD_VERSION}/pmd-dist-${PMD_VERSION}-bin.zip"
+              unzip -q pmd.zip
+              PMD_HOME="pmd-bin-${PMD_VERSION}"
+          
+              "${PMD_HOME}/bin/pmd" cpd \
+                --dir src \
+                --language fortran \
+                --minimum-tokens=40