restore cross-version testing

Author: FGasper

.github/workflows/all.yml

@@ -11,13 +11,40 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        mongodb_version:
-          - '4.2'
-          - '4.4'
-          - '5.0'
-          - '6.0'
-          - '7.0'
-          - '8.0'
+        mongodb_versions:
+          - src: '4.2'
+            dst:
+              - '4.2'
+              - '4.4'
+              - '5.0'
+              - '6.0'
+
+          - src: '4.4'
+            dst:
+              - '4.4'
+              - '5.0'
+              - '6.0'
+
+          - src: '5.0'
+            dst:
+              - '5.0'
+              - '6.0'
+              - '7.0'
+
+          - src: '6.0'
+            dst:
+              - '6.0'
+              - '7.0'
+              - '8.0'
+
+          - src: '7.0'
+            dst:
+              - '7.0'
+              - '8.0'
+
+          - src: '8.0'
+            dst:
+              - '8.0'
 
         topology:
           - name: replset
@@ -39,8 +66,17 @@ jobs:
       - name: Install m
         run: npm install -g m mongosh
 
-      - name: Activate MongoDB ${{ matrix.mongodb_version }}
-        run: yes | m ${{ matrix.mongodb_version }}
+      - name: Install MongoDB versions
+        run: yes | m ${{ matrix.mongodb_versions.src }} ${{ matrix.mongodb_versions.dst }} stable
+
+      - name: Set & save source version
+        run: m ${{ matrix.mongodb_versions.src }} && dirname $(readlink $(which mongod)) > .srcpath
+
+      - name: Set & save destination version
+        run: m ${{ matrix.mongodb_versions.dst }} && dirname $(readlink $(which mongod)) > .dstpath
+
+      - name: Set & save metadata version
+        run: m stable && dirname $(readlink $(which mongod)) > .metapath
 
       - name: Install mtools
         run: pipx install 'mtools[all]'
@@ -59,9 +95,9 @@ jobs:
       - name: Start clusters
         run: |-
             {
-                echo "mlaunch init --port 27020 --dir src --replicaset ${{ matrix.topology.args }}"
-                echo "mlaunch init --port 27030 --dir dst --replicaset ${{ matrix.topology.args }}"
-                echo "mlaunch init --port 27040 --dir meta --replicaset --nodes 1"
+                echo "mlaunch init --binarypath $(cat .srcpath) --port 27020 --dir src --replicaset ${{ matrix.topology.args }}"
+                echo "mlaunch init --binarypath $(cat .dstpath) --port 27030 --dir dst --replicaset ${{ matrix.topology.args }}"
+                echo "mlaunch init --binarypath $(cat .metapath) --port 27040 --dir meta --replicaset --nodes 1"
             } | parallel
 
       - name: Test