Remove dockerfile, using podman with latest snippet of working action

action.yml

@@ -6,7 +6,25 @@ inputs:
     required: true
 
 runs:
-  using: "docker"
-  image: "Dockerfile"
-  args:
-    - ${{ inputs.spec-file-path }}
+  using: "composite"
+  steps:
+    - name: Setup workspace
+      shell: bash
+      env:
+        SPEC_FILE_PATH: ${{ inputs.spec-file-path }}
+      run: |
+        mkdir -p ./rpmbuild/{RPMS,SPECS}
+        cp ${SPEC_FILE_PATH} ./rpmbuild/SPECS
+
+    - name: Build RPM
+      shell: bash
+      env:
+        SPEC_FILE_PATH: ${{ inputs.spec-file-path }}
+      run: |
+        SPEC_FILE_NAME=$(basename ${SPEC_FILE_PATH})
+        podman run --rm \
+          -v ./rpmbuild:/root/rpmbuild:rw,z \
+          -v ./entrypoint.sh:/root/entrypoint.sh:ro,z \
+          -w /root \
+          fedora:latest \
+          /root/entrypoint.sh /root/rpmbuild/SPECS/${SPEC_FILE_NAME}