Docker: Add mariadb note to docker-compose.yml examples #1680

see https://github.com/photoprism/photoprism/discussions/1680

docker/examples/arm64/docker-compose.yml

@@ -119,8 +119,9 @@ services:
       - seccomp:unconfined
       - apparmor:unconfined
     command: mysqld --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "./database:/var/lib/mysql" # never remove
+      - "./database:/var/lib/mysql" # Important, don't remove
     environment:
       MYSQL_ROOT_PASSWORD: insecure
       MYSQL_DATABASE: photoprism

docker/examples/armv7/docker-compose.yml

@@ -117,8 +117,9 @@ services:
       - seccomp:unconfined
       - apparmor:unconfined
     command: mysqld --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "./mariadb:/config" # never remove
+      - "./mariadb:/config" # Important, don't remove
     environment:
       MYSQL_ROOT_PASSWORD: insecure
       MYSQL_DATABASE: photoprism

docker/examples/cloud/docker-compose.yml

@@ -195,8 +195,9 @@ services:
       - seccomp:unconfined
       - apparmor:unconfined
     command: mysqld --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "./database:/var/lib/mysql" # never remove
+      - "./database:/var/lib/mysql" # Important, don't remove
     environment:
       MYSQL_ROOT_PASSWORD: "_admin_password_"
       MYSQL_DATABASE: "photoprism"

docker/examples/docker-compose.yml

@@ -120,8 +120,9 @@ services:
       - seccomp:unconfined
       - apparmor:unconfined
     command: mysqld --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "./database:/var/lib/mysql" # never remove
+      - "./database:/var/lib/mysql" # Important, don't remove
     environment:
       MYSQL_ROOT_PASSWORD: insecure
       MYSQL_DATABASE: photoprism

docker/examples/macos/docker-compose.yml

@@ -100,8 +100,9 @@ services:
     ## --lower-case-table-names=1 stores tables in lowercase and compares names in a case-insensitive manner
     ## see https://mariadb.com/kb/en/server-system-variables/#lower_case_table_names
     command: mysqld --lower-case-table-names=1 --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "mariadb_data:/var/lib/mysql" # never remove
+      - "mariadb_data:/var/lib/mysql" # Important, don't remove
     environment:
       MYSQL_ROOT_PASSWORD: insecure
       MYSQL_DATABASE: photoprism

docker/examples/scheduler/docker-compose.yml

@@ -112,8 +112,9 @@ services:
       - seccomp:unconfined
       - apparmor:unconfined
     command: mysqld --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "./database:/var/lib/mysql" # never remove
+      - "./database:/var/lib/mysql" # Important, don't remove
     environment:
       MYSQL_ROOT_PASSWORD: insecure
       MYSQL_DATABASE: photoprism

docker/examples/windows/docker-compose.yml

@@ -104,8 +104,9 @@ services:
     ## --lower-case-table-names=1 stores tables in lowercase and compares names in a case-insensitive manner
     ## see https://mariadb.com/kb/en/server-system-variables/#lower_case_table_names
     command: mysqld --lower-case-table-names=1 --transaction-isolation=READ-COMMITTED --character-set-server=utf8mb4 --collation-server=utf8mb4_unicode_ci --max-connections=512 --innodb-rollback-on-timeout=OFF --innodb-lock-wait-timeout=120
+    ## Never store database files on a shared network drive or open them with two server instances at the same time:
     volumes:
-      - "mariadb_data:/var/lib/mysql" # never remove, the named volume "mariadb_data" is defined at the bottom
+      - "mariadb_data:/var/lib/mysql" # Important, don't remove; named volume "mariadb_data" is defined at the bottom
     environment:
       MYSQL_ROOT_PASSWORD: insecure
       MYSQL_DATABASE: photoprism