github-ci: cache RPMs on dnf distros

.github/workflows/builds.yml

@@ -150,6 +150,13 @@ jobs:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
 
+      - name: Cache RPMs
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/dnf
+          key: ${{ github.job }}-dnf
+      - run: echo "keepcache=1" >> /etc/dnf/dnf.conf
+
       - uses: actions/checkout@v3.1.0
 
       # Download and extract dependency archives created during prep
@@ -258,6 +265,13 @@ jobs:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
 
+      - name: Cache RPMs
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/dnf
+          key: ${{ github.job }}-dnf
+      - run: echo "keepcache=1" >> /etc/dnf/dnf.conf
+
       - uses: actions/checkout@v3.1.0
 
       # Prebuild check for duplicat SIDs
@@ -380,6 +394,7 @@ jobs:
         with:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
+
       - name: Install system dependencies
         run: |
           yum -y install epel-release
@@ -454,6 +469,13 @@ jobs:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
 
+      - name: Cache RPMs
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/dnf
+          key: ${{ github.job }}-dnf
+      - run: echo "keepcache=1" >> /etc/dnf/dnf.conf
+
       - run: |
           dnf -y install \
                 autoconf \
@@ -544,6 +566,13 @@ jobs:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
 
+      - name: Cache RPMs
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/dnf
+          key: ${{ github.job }}-dnf
+      - run: echo "keepcache=1" >> /etc/dnf/dnf.conf
+
       - run: |
           dnf -y install \
                 autoconf \
@@ -638,6 +667,13 @@ jobs:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
 
+      - name: Cache RPMs
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/dnf
+          key: ${{ github.job }}-dnf
+      - run: echo "keepcache=1" >> /etc/dnf/dnf.conf
+
       - run: |
           dnf -y install \
                 autoconf \
@@ -729,6 +765,13 @@ jobs:
           path: ~/.cargo
           key: ${{ github.job }}-cargo
 
+      - name: Cache RPMs
+        uses: actions/cache@v3
+        with:
+          path: /var/cache/dnf
+          key: ${{ github.job }}-dnf
+      - run: echo "keepcache=1" >> /etc/dnf/dnf.conf
+
       - run: |
           dnf -y install \
                 autoconf \