Creating centos7 and centos8 RPMs

.github/workflows/build_rpm.sh

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+cd $HOME/rpmbuild || exit 1
+spectool -g -R SPECS/prometheus-slurm-exporter.spec
+rpmbuild -ba SPECS/prometheus-slurm-exporter.spec

.github/workflows/go_config.sh

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+rm -f go.mod
+go get -v -u github.com/prometheus/client_golang/prometheus
+go get -v -u github.com/sirupsen/logrus
+go get -v -u gopkg.in/alecthomas/kingpin.v2
+go get -v -u github.com/m3db/prometheus_common/log
+mkdir -p ${GOPATH}/src/github.com/prometheus/common/log/
+cp -r ${GOPATH}/src/github.com/m3db/prometheus_common/log/* ${GOPATH}/src/github.com/prometheus/common/log/

.github/workflows/prep_rpm.sh

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+mkdir -p ~/rpmbuild/{BUILD,RPMS,SOURCES,SPECS,SRPMS,tmp}
+echo '%_topdir %(echo $HOME)/rpmbuild' > ~/.rpmmacros
+cp README.md ~/rpmbuild/SOURCES
+cp LICENSE ~/rpmbuild/SOURCES
+cp bin/prometheus-slurm-exporter ~/rpmbuild/SOURCES
+cp lib/systemd/prometheus-slurm-exporter.service ~/rpmbuild/SOURCES
+cp packages/rpm/*.spec ~/rpmbuild/SPECS

.github/workflows/rpm_ci.yml

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+name: Prometheus Slurm Exporter
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  centos8:
+    runs-on: ubuntu-latest
+    container:
+      image: centos:centos8
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Prerequisites
+        run: dnf install -y rpm-build rpmdevtools redhat-rpm-config make git go
+      - name: Configure Go Libraries
+        run: |
+          export GOPATH=$(pwd)
+          /bin/bash .github/workflows/go_config.sh
+      - name: Compile Exporter
+        run: make build
+      - name: Prepare RPM Environment
+        run: /bin/bash .github/workflows/prep_rpm.sh
+      - name: Build RPM
+        run: /bin/bash .github/workflows/build_rpm.sh
+      - name: Upload RPM
+        uses: actions/upload-artifact@v2
+        with:
+          name: prometheus-slurm-exporter-centos8-x86_64-latest
+          path: /github/home/rpmbuild/RPMS/x86_64/*.rpm
+  centos7:
+    runs-on: ubuntu-latest
+    container:
+      image: centos:centos7
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Prerequisites
+        run: |
+          yum install -y epel-release
+          yum update -y
+          yum install -y rpm-build rpmdevtools redhat-rpm-config make git golang
+      - name: Configure Go Libraries
+        run: |
+          export GOPATH=$(pwd)
+          /bin/bash .github/workflows/go_config.sh
+      - name: Compile Exporter
+        run: make build
+      - name: Prepare RPM Environment
+        run: /bin/bash .github/workflows/prep_rpm.sh
+      - name: Build RPM
+        run: /bin/bash .github/workflows/build_rpm.sh
+      - name: Upload RPM
+        uses: actions/upload-artifact@v2
+        with:
+          name: prometheus-slurm-exporter-centos7-x86_64-latest
+          path: /github/home/rpmbuild/RPMS/x86_64/*.rpm